source: git/Singular/LIB/gradedModules.lib @ d088e2

spielwiese
Last change on this file since d088e2 was d088e2, checked in by Oleksandr Motsak <motsak@…>, 9 years ago
Fixed grsumstr in case of zero twists + print the size of zero matrices
  • Property mode set to 100644
File size: 195.0 KB
Line 
1//////////////////////////////////////////////////////////////////////////
2version="version gradedModules.lib 4.0.1.1 Jan_2015 "; // $Id$
3category="Commutative Algebra";
4info="
5LIBRARY: gradedModules.lib     Operations with graded modules/matrices/resolutions
6AUTHORS:  Oleksandr Motsak <U@D>, where U=motsak, D=mathematik.uni-kl.de
7@*        Hanieh Keneshlou <hkeneshlou@yahoo.com>
8KEYWORDS: graded modules, graded homomorphisms, syzygies
9OVERVIEW:
10    The library contains several procedures for constructing and manipulating graded modules/matrices/resolutions.
11    Basics about graded objects can be found in [DL].
12    Throughout this library graded objects are graded maps, that is,
13    matrices with polynomials, together with grading weights for source and
14    destination. Graded modules are implicitly given as coker of a graded map.
15    Note that in special cases we may also consider submodules in S^r generated
16    by columns of a graded polynomial matrix (or a graded map).
17NOTE:
18    set assumeLevel to positive integer value in order to auto-check all assumptions.
19    We denote the current basering by S.
20REFERENCES:
21[DL] Decker, W., Lossen, Ch.: Computing in Algebraic Geometry, Springer, 2006
22PROCEDURES:
23    grobj(M,w[,d])  construct a graded object (map) given by matrix M
24    grtest(A)       check whether A is a valid graded object
25    grisequal(A,B)  check whether A is exactly eqal to B? TODO: isomorphic!
26    grdeg(M)        compute graded degrees of columns of the map M
27    grview(M)       view the graded structure of map M
28    grshift(M,d)    shift graded module coker(M) by d
29    grzero()        presentation of S(0)^1
30    grtwist(r,d)    presentation of S(-d)^r
31    grtwists(v)     presentation of S(-v[1])+...+S(-v[size(v)])
32    grsum(M,N)      direct sum of two graded modules coker(M) + coker(N)
33    grpower(M,p)    direct p-th power of graded module coker(M)
34    grtranspose(M)  un-ordered graded transpose of map M       
35    grgens(M)       try to compute submodule generators of coker(M)
36    grpres(F)       presentation of submodule generated by columns of F
37    grorder(M)      reorder cols/rows of M for correct graded-block-structure
38    grtranspose1(M)  reordered graded transpose of map M
39    TestGRRes(n,I)  compute/order/transpose a graded resolution of ideal I
40    KeneshlouMatrixPresentation(v)  build some presentation with intvec v
41    grsyz(M)        syzygy of Im(M)
42    grres(M,l[,m])  resolution of Im(M) of length l... minimal?
43    grlift(A,B)     graded lift, gens!
44    grprod(A,B)     composition of graded maps (product of matrices?)
45    grgroebner(M)   Groebner Basis of Im(M) as a graded object
46    grconcat(M,N)   sum of maps into the same target module
47    grrndmat(s,d[,p,b])   generate random matrix compatible with src and dst gradings
48    grrndmap(S,D[,p,b])   generate random 0-deg homomorphism src(S) -> src(D)
49    grrndmap2(S,D[,p,b])   generate random 0-deg homomorphism dst(S) -> dst(D)
50    grlifting(A,B)     RND! chain lifting
51    grlifting2(A,B)    RND! chain lifting
52    mappingcone(M,N)   mapping cone?
53    mappingcone2(M,N)  mapping cone2?
54    grlifting3(A,B)    RND! chain lifting? probably wrong one
55    grlifting4(A,B)    RND! chain lifting? newer from #hani# for mappingcone3
56    mappingcone3(A,B)  mapping cone3? (using grlifting4 at the moment)
57    grrange(M)         get the row-weightings
58";
59
60LIB "matrix.lib"; // ?
61
62//////////////////////////////////////////////////////////////////////////////////////////////////////////
63// . view graded module/map
64// . reorder graded resolution
65// . transpose graded module/map?
66
67// draw helpers
68static proc repeat(int n, string c) { string r = ""; while( n > 0 ){ r = r + c; n--; } return(r); }
69static proc pad(int m, string s, string c){ string r = s; while( size(r) < m ){ r = c + r; } return(r); }
70static proc mstring( int m, string c){ if( m < 0 ) { return (c); }; return (string(m)); }
71
72static proc grsumstr(string R, intvec v)
73"direct sum_i=1^size R(-v[i]), for source and targets of graded objects"
74{
75  if (R == "")
76  {
77    R = nameof(basering);
78  }
79
80  ASSUME(0, defined(R) && (R != "") );
81
82  int n = size(v);
83
84  if (n == 0) { return (R); }
85
86  ASSUME(0, n > 0 );
87 
88  v = -v; // NOTE: due to Mathematical meanings of Singular data
89 
90
91  int lst = v[1];
92  int cnt = 1;
93
94  string p = R;
95  if( lst != 0 ) { p = p + "(" + string(lst) + ")"; }
96
97  int k, d;
98  for (k = 2; k <= n; k++ )
99  {
100    d = v[k];
101    if( d == lst ) { cnt = cnt + 1; }
102    else
103    {
104      if (cnt > 1){ p = p + "^" + string(cnt); }
105
106      cnt = 1; lst = d;
107
108      p = p + " + " + R;
109      if( lst != 0 ) { p = p + "(" + string(lst) + ")"; }
110    }
111  }
112  if (cnt > 1){ p = p + "^" + string(cnt); }
113
114  return (p);
115}
116example
117{ "EXAMPLE:"; echo = 2;
118
119  ring r=32003,(x,y,z),dp;
120
121  def E = grtwist(2, 0);
122  def v = grrange(E); // grdeg(E);
123  grsumstr("", v ); 
124}
125
126// view helper
127static proc draw ( intmat D, int d )
128{
129//  print(D); return ();
130  int nc = ncols(D); int nr = nrows(D);
131  int s, r, c; int max = 0;
132  // get maximum string-length among all {D[r,c]}
133  for (r = nr; r > 0; r-- ) { for (c = nc; c > 0; c-- ) { s = size( string(D[r, c]) ); if( max < s ) { max = s; } } }
134  max = max + 1;
135  string head = ""; string foot = ""; string middle = "";
136  for ( c = d+1; c < (nc-d); c++ )
137  {
138    head = head + pad(max, string(D[1 , c]), ".") + " ";
139    foot = foot + pad(max, string(D[nr, c]), " ") + " ";
140  }
141  // last head/foot enties:
142  head = head + pad(max, string(D[1 , c]), ".");
143  foot = foot + pad(max, string(D[nr, c]), " ");
144  // head/foot dash lines:
145  string dash  = "-"; string dash2  = "=";
146  dash = repeat( (nc - 2*d) - 1 , repeat(max, dash) + " " ) + repeat(max, dash) + " "; // dash  = repeat( (max + 1) * (nc - 2*d) , dash );
147  dash2 = repeat( (nc - 2*d) - 1 , repeat(max, dash2) + " " ) + repeat(max, dash2) + " "; // dash2 = repeat( (max + 1) * (nc - 2*d) , dash2);
148  for ( r = d+1; r <= (nr-d); r++ )
149  {
150    middle = middle + pad(max, string(D[r,1]), " ") + " :";
151    for ( c = d+1; c < (nc-d); c++ ) { middle = middle + pad(max, mstring(D[r,c], "-"), " ") + " "; }
152    middle = middle + pad(max, mstring(D[r,nc-d], "-"), " ") + " |" + pad(max, string(D[r,nc]), ".") + newline;
153  }
154  string corner_id = repeat(max, ".");
155  string corner = repeat(max, " ");
156  // print everything all at once:
157  print                                     (
158      corner + "  " + head  + " ." + corner_id + newline +
159      corner + "  " + dash  + "+"  + corner_id + newline +
160                      middle                          +
161      corner + "  " + dash2 + " "  + corner + newline +
162      corner + "  " + foot +  "  " + corner );
163}
164
165proc grview(N)
166"USAGE:  grview(M), graded object M
167RETURN:  nothing
168PURPOSE: print the degree/grading data about the GRADED matrix/module/ideal/mapping object M
169ASSUME:  M must be graded
170EXAMPLE: example grview; shows an example
171"
172{
173//  if( size(N) == 0 ) { return (); }
174  string msg = "Graded";
175  string lst;
176
177  string arrow = " <- ";
178  string R = nameof(basering);
179
180  if( typeof( N ) == "list" )
181  {
182    msg = msg + " resolution";
183    if( size(R) >= 2 )
184    {
185      msg = msg + "(let R:="+R+")";
186      R = "R";
187    }
188
189
190    int i = 1;  int n = size(N);
191    string dst;
192   
193    msg = msg + ": " + newline + grsumstr(R, grrange(N[i])) + " <-- d_" + string(i) + " -- " ;
194    for( ; i < n; i++ )
195    {
196      dst = grsumstr(R, grdeg(N[i])) +  " <-- d_" + string(i+1) + " --";
197      msg = msg + newline + dst;
198    };
199
200    msg = msg + newline + grsumstr(R, grdeg(N[i])) + ", given by maps: ";
201
202    print(msg);
203
204    for( i = 1; i <= size(N); i++ )
205    {
206      "d_" + string(i) + " :"; grview(N[i]);
207    };
208
209    return ();
210  }
211
212//  typeof( N ) ;  attrib( N );  grrange(N);
213
214  ASSUME(1, grtest(N) );
215
216  intvec G = grdeg(N);
217  matrix M = module(N);
218
219  int nc = ncols(M); int nr = nrows(M);
220  int r,c;
221  int d = 1; // number of extra cols/rows for extra info around the central degree(N) block in D
222  intmat D[nr+2*d][nc+2*d];
223
224  for( c = nc; c > 0; c-- )
225  {
226    D[1, c+d] = c; // top row indeces
227    D[nr+2*d, c+d] = G[c]; // deg(v) + gr[ leadexp(v)[m] ]; // bottom row with computed column induced degrees
228  }
229
230  intvec gr = grrange(N); // grading weights?
231
232  for( r = nr; r > 0; r-- )
233  {
234    D[r+d, 1] = gr[r]; // left-most column with grading data
235    for( c = nc; c > 0; c-- )
236    {
237      D[r+d, c+d] = deg(M[r, c]); // central block with degrees (-1 means zero entry)
238    }
239    D[r+d, nc+2*d] = r; // right-most block with indeces
240  }
241
242  msg = msg + " homomorphism";
243  if( size(R) >= 2 )
244  {
245    msg = msg + "(let R:="+R+")" ;
246    R = "R";
247  }
248   
249  msg = msg + ": ";
250
251  string dst = grsumstr(R, gr);
252  string src = grsumstr(R, G);
253
254  lst = msg;
255
256  if( (size(lst) + size(dst) + size(src) + 4) > 80 )
257  {
258    if( (size(lst) + size(dst)) > 80 ) { msg = msg + newline; lst = ""; }
259
260    msg = msg + dst + arrow;
261    lst = lst + dst + arrow;
262
263    if( (size(lst) + size(src)) > 80 ) { msg = msg + newline; lst = ""; }
264
265    msg = msg + src;
266    lst = lst + src;
267  } else
268  {
269    msg = msg + dst + arrow + src;
270    lst = lst + dst + arrow + src;
271  }
272
273  if( size(lst) > 70 ) { msg = msg + newline; } // lst = "";
274  msg = msg + ", given by ";
275//  lst = lst + ", given by ";
276
277  if( size(N) == 0 )
278  {
279    msg = msg + "zero ("+ string(nr);
280    if( nr == nc ) { msg = msg + "^2"; } else { msg = msg + " x " + string(nc); }
281    print( msg+") matrix." );
282  } else
283  {
284    if( nr == nc) // square matrix // detect diagonal?
285    {
286      for (c = nr; c > 0; c-- )
287      {
288        M[c,c] = 0;
289      }
290
291      if( size(module(M)) == 0 )
292      {
293        msg = msg + "a diagonal matrix";
294      } else
295      {
296        msg = msg + "a square matrix";
297      }
298
299    } else
300    {
301      msg = msg + "a matrix";
302    }
303   
304    print(msg + ", with degrees: " );
305    draw(D, d); // print it nicely!   
306  }
307}
308example
309{ "EXAMPLE:"; echo = 2;
310
311  ring r=32003,(x,y,z),dp;
312
313  module A = grobj( module([x+y, x, 0, 0], [0, x+y, y, 0]), intvec(0,0,0,1) );
314  grview(A);
315
316  module B = grobj( module([0,x,y]), intvec(15,1,1) );
317  grview(B);
318
319  module D = grsum( grsum(grpower(A,2), grtwist(1,1)), grsum(grtwist(1,2), grpower(B,2)) );
320  grview(D);
321
322  ring R = 0,(w,x,y,z), dp; def I = grobj( ideal(y2-xz, xy-wz, x2z-wyz), intvec(0) );
323  list res1 = grres(I, 0); // non-minimal
324  grview(res1);
325  print(betti(res1,0), "betti");
326
327  list res2 = grres(grshift(I, -10), 0, 1); //  minimal!
328  grview(res2);
329  print(betti(res2,0), "betti");
330}
331
332static proc issorted( intvec g, int s )
333{
334  g = s * g; //  "g: ", g;
335  int i = size(g);
336
337  for(; i > 1; i--)
338  {
339    if( (g[i] - g[i-1]) < 0 )
340    {
341      return (0);
342    }
343  }
344
345  return (1);
346}
347
348static proc mysort( intvec gr, int s )
349"
350computes the permutation P of gr, such that (s*gr)[P] is ascendingly sorted
351NOTE: looks like a bubble sort (was taken from sort) and modified to ensure stability!
352TODO: replace with some kernel function if this turns out to be inefficient!!
353"
354{
355  gr = s * gr;
356  int m = size(gr);
357  intvec pivot;
358
359  int Bi;
360  // compute reordering permutation pivot such that gr[pivot] is (stably) sorted
361  for(Bi=m; Bi>0; Bi--) { pivot[Bi]=Bi; } // pivot = Id_m for starters
362
363  int Bn,Bb; int P, D;
364
365  int Bj = 0; int flag = 0;
366
367  // Bi == 0
368  while(Bj==0)
369  {
370    Bi++; Bj=1;
371    for(Bn=1; Bn <= (m-Bi); Bn++)
372    {
373      D = (gr[pivot[Bn]] - gr[pivot[Bn+1]]); // sort gr
374      P = (D > 0) or ( (D == 0) && ((pivot[Bn]-pivot[Bn+1]) > 0) ); // stability!?
375      if(P)
376      {
377        Bb=pivot[Bn];
378        pivot[Bn]=pivot[Bn+1];
379        pivot[Bn+1]=Bb;
380
381        Bj=0; flag = 1;
382      }
383    }
384  }
385
386/*
387  if( flag ) // output details in case of non-identical permutation?
388  {
389    // grades & ordering permutation : gr[pivot] should be sorted:
390    "s: ", s;
391    "gr: ", gr;
392    "pivot: ",    pivot;
393  }
394*/
395  ASSUME(1, issorted(intvec(gr[pivot]), 1));
396
397  return (pivot);
398}
399
400// Q@Wolfram: what should be done with zero gens!?
401proc grdeg(M)
402"USAGE:  grdeg(M), graded object M
403RETURN:  intvec of degrees
404PURPOSE: graded degrees of columns (generators) of M
405ASSUME:  M must be a graded object (matrix/module/ideal/mapping)
406NOTE:    if M has zero cols it shoud have attrib(M,'degHomog') set.
407EXAMPLE: example grdeg; shows an example
408"
409{
410  ASSUME(1, grtest(M) );
411
412  if ( typeof(attrib(M, "degHomog")) == "intvec" )
413  {
414    intvec t = attrib(M, "degHomog"); // graded degrees
415    ASSUME(0, ncols(M) == size(t) );
416
417    return (t);
418  }
419
420  ASSUME(0, ncols(M) == size(M) );
421
422  def w = grrange(M); // grading weights?
423
424  if( size(M) == 0 ){ return (w); } // TODO: Q@Wolfram!???
425
426  int m = ncols(M); // m > 0 in Singular!
427  int n = nvars(basering) + 1; // index of mod. column in the leadexp
428
429  module L = lead(M[1..m]); // leading module-terms for input column vectors
430  intvec d = deg(L[1..m]); // their degrees
431  intvec c = leadexp(L[1..m])[n]; // their module-components
432
433//   w = intvec(-6665), w; // 0?????
434  intvec gr = w[c]; //  + 1]; // weights?????
435
436  gr = gr + d; // finally we compute their graded degrees
437
438  return (gr);
439}
440example
441{ "EXAMPLE:"; echo = 2;
442
443  ring r=32003,(x,y,z),dp;
444
445  module A = grobj( module([x+y, x, 0, 0], [0, x+y, y, 0]), intvec(0,0,0,1) );
446  grview(A);
447
448  module B = grobj( module([0,x,y]), intvec(15,1,1) );
449  grview(B);
450
451  module D = grsum(
452                   grsum(grpower(A,2), grtwist(1,1)),
453                   grsum(grtwist(1,2), grpower(B,2))
454                  );
455
456  grview(D);
457  grdeg(D);
458
459  def D10 = grshift(D, 10);
460
461  grview(D10);
462  grdeg(D10);
463}
464
465static proc reorder(def M, int s)
466"
467Reorder gens of M: compute graded degrees and the permutation to sort them
468"
469{
470  // input should be graded:
471  ASSUME(1, grtest(M) );
472
473  intvec w = grrange(M); // grading weights
474
475  intvec gr = grdeg( M );
476
477//  intvec d = deg(M[1..nocls(M)]); // no need to deal with un-weighted degrees??!
478
479  intvec pivot = mysort(gr, s);
480
481  // grades & ordering permutation for N.  gr[pivot] should be sorted!
482  ASSUME(1, issorted(gr[pivot], s));
483
484  module N = grobj(module(M[pivot]), w, intvec(gr[pivot]));  // reorder the starting ideal/module
485
486//  "reorder: "; grview(N);
487
488  return (N, intvec(gr[pivot]));
489}
490
491proc grtranspose1(def M)
492"USAGE:  grtranspose1(M), graded object or list M
493RETURN:  same as input
494PURPOSE: graded transpose of graded object or chain complex M
495ASSUME:  M must be a graded object or a list of graded objects
496EXAMPLE: example grtranspose1; shows an example
497"
498{
499  if( typeof( M ) == "list" )
500  {
501    if( size(M) == 0 ) { return (); }
502
503    int j = size(M);
504
505    int i = 1;
506
507    // TODO: extra grading argument???
508    while( i < j )
509    {
510     if( size(M[i]) == 0 ){ break; }
511     ASSUME(0, typeof(grrange(M[i])) == "intvec");
512     i++;
513    }
514
515    if( size(M[i]) == 0 ) { i--; }
516
517    j = i; i = 1;
518
519    list L;
520    while( j > 0 )
521    {
522//      grview(M[i]);
523      L[j] = grtranspose1( grobj( M[i], grrange(M[i])) );
524//      grview(L[j]);
525
526      if( (i > 1) && (j > 0) )
527      {
528//        grview(L[j+1]);
529        ASSUME(2, size( module( matrix(L[j])*matrix(L[j+1]) ) ) == 0 );
530      };
531//      grview(L[j]);
532      j--; i++;
533    };
534    return (L); // ?
535  }
536
537//////
538// "a";  grview(M);
539  ASSUME(1, grtest(M) );
540
541 intvec d; module N;
542
543 (N,d) = reorder(M, -1);
544
545 kill M; module M = grobj(transpose(N), -d, -grrange(N));
546
547// "b";  grview(M);
548
549 kill N,d; module N; intvec d;
550 // reverse order:
551 (N,d) = reorder(M, 1); kill M;
552
553// "e"; grview( N );
554
555 ASSUME(1, issorted( grrange(N), 1) );
556 ASSUME(1, issorted(grdeg(N), 1) );
557
558
559 return (N);
560}
561example
562{ "EXAMPLE:"; echo = 2;
563
564  "Surface Name: 'k3.d10.g9.quart2' in P^4";
565  int @p=31991; ring R = (@p),(x,y,z,u,v), dp;
566  ideal J = 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567
568  def I = grobj( groebner(J), intvec(0) ); // ASSUME: no zero entries in J!
569  ASSUME(0, grtest(I));
570  "Input degrees: "; grview(I);
571
572  def RR = grres(I, 0, 1); list L = RR;
573
574  " = Non-minimal betti numbers: "; print(betti(L, 0), "betti");
575
576  "Graded (original) structure of 'res(Input,0)': "; grview(L);
577
578  "Graded transpose of the previous resolution "; list LLL = grtranspose1( L ); grview( LLL );
579
580  "Its non-minimal betti numbers: "; print(betti(LLL, 0), "betti");
581
582}
583
584proc grorder(def M)
585"USAGE:  grorder(M), graded object or list M
586RETURN:  same as input
587PURPOSE: reorder/transform graded object or chain complex M into block form
588ASSUME:  M must be a graded object or a list of graded objects
589EXAMPLE: example grorder; shows an example
590"
591{
592  if( typeof(M) == "list" )
593  { // TODO: extra grading argument???
594    if( size(M) == 0 ) { return (); }
595
596    int j = size(M);  int i = 1;
597
598    while( i < j )
599    {
600      if( size(M[i]) == 0 ){ break; }
601      ASSUME(0, typeof(grrange(M[i])) == "intvec");
602      i++;
603    }
604
605    if( size(M[i]) == 0 ) { i--; }
606
607    list L; module Z = 0; L[i] = Z; j = i;
608
609    while( i > 0 )
610    {
611//      "i: ", i;      "A"; grview(M[i]);
612      L[i] = grorder( grobj( M[i], grrange(M[i])) );
613//      "B"; grview(L[i]);
614      if( i < j )
615      {
616        ASSUME(2, size( module( matrix(transpose(L[i+1]))*matrix(transpose(L[i])) ) ) == 0 );
617      };
618
619      i--;
620    };
621
622    return (L); // ?
623  }
624
625  ASSUME(1, grtest(M) );
626
627// "a";  grview(M);
628
629  intvec d; module N;
630
631  (N,d) = reorder(M, 1); kill M;
632
633  module M = grobj(transpose(N), -d, -grrange(N)); kill N,d;
634
635// "b";  grview(M);
636
637  module N; intvec d;
638  // reverse order:
639  (N,d) = reorder(M, -1); kill M;
640
641  module M = grobj(transpose(N), -d, -grrange(N));
642
643// "c";  grview(M);
644
645  ASSUME(1, issorted(grrange(M), 1) );
646  ASSUME(1, issorted(grdeg(M), 1) );
647
648  return (M);
649}
650example
651{ "EXAMPLE:"; echo = 2;
652
653  "Surface Name: 'rat.d10.g9.quart2' in P^4";
654  int @p=31991; ring R = (@p),(x,y,z,u,v), dp;
655  ideal J = 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656
657  def I = grobj( groebner(J), intvec(0) ); // ASSUME: no zero entries in J!
658  ASSUME(0, grtest(I));
659
660  "Input degrees: "; grview(I);
661
662  def RR = grres(I, 0, 1);
663  list L = RR;
664
665  " = Non-minimal betti numbers: ";  print(betti(L, 0), "betti");
666  "Graded reordered structure of 'res(Input,0)': ";  grview(grorder(L));
667}
668
669proc TestGRRes(Name, J)
670"USAGE:  TestGRRes(name, I), string name, ideal I
671RETURN:  nothing
672PURPOSE: compute/test/output/order/transpose a graded resolution of I
673EXAMPLE: example TestGRRes; shows an example
674"
675{
676  "==============================================";
677  "";
678  "=== Example: [", Name, "]";
679  " = Ring: ", string(basering);
680
681  def I = grobj( groebner(J), intvec(0) ); // ASSUME: no zero entries in J!
682  ASSUME(0, grtest(I));
683//  " = Input degrees: "; grview(I);
684
685  " ! Resolution via 'grres': ";
686  def R = grres(I, 0, 1); // sres, lres: no grading! // nres, mres - graded (with attrib(, "isHomog"))
687
688  " = Non-minimal betti numbers: ";
689  print(betti(R, 0), "betti");
690
691  list L = R ; // SRES_list(R); //  " = Degrees of maps: "; grview(L); // MUST BE GRADED!!!
692
693  " = Degrees of (ordered) maps: ";
694  def LL = grorder(L); // MUST BE GRADED
695
696  // ordres(L, intvec(0)); // ?
697
698  grview( LL ); " = TRANSPOSE'd complex: %%%%%%%%%%%%%%";
699  list LLL = grtranspose1( LL ); //  resolution RR = LLL;
700  print(betti(LLL, 0), "betti");
701
702  grview( LLL ); ""; //  "==============================================";
703
704  kill L, R;
705}
706example
707{ "EXAMPLE:"; echo = 2;
708//  if( defined(assumeLevel) ){ int assumeLevel0 = assumeLevel; } else { int assumeLevel; export(assumeLevel); }; assumeLevel = 5; // store the state of aL
709
710  // note: data from random generation 2
711  string Name = "castelnuovo"; int @p=31991; ring R = (@p),(x,y,z,u,v), dp;ideal I = 5153xy2-98/23y3-101/51xyz+33/41y2z+99/79xz2+7136yz2-106/111z3+119/53xyu+34/57y2u-77/92xzu+84/73yzu-109/78z2u-27/56xu2+10023yu2+82/103zu2-34/25u3+3/2xyv-68/25y2v+12721xzv+4/63yzv-73/21z2v-7291xuv-91/53yuv-4/79zuv-34/91u2v-122/53xv2+123/70yv2-64/73zv2+44/65uv2+14/31v3,xy2-15202y3+10613xyz+13640y2z-107/103xz2+5292yz2+19/119z3-10042xyu+2770y2u+7957xzu+14008yzu+92/121z2u-92/51xu2+1178yu2+1/117zu2-12726u3+82/101xyv-92/17y2v-107/56xzv+14233yzv+79/28z2v+51/50xuv-31/5yuv+95/91zuv+19/108u2v+12151xv2-69/110yv2+37/89zv2-63/116uv2-88/23v3,-5153x2+37/23xy+8706y2-13160xz+68/115yz+5548z2-22/61xu-113/98yu+11818zu+2114u2-101/97xv+89/22yv-3355zv-113/5uv-5521v2;TestGRRes(Name, I); kill R, Name, @p;  "";
712
713  string Name = "ell.d8.g7"; int @p=31991; ring R = (@p),(x,y,z,u,v), dp;ideal I = x2y2-47/69xy3+6059y4+78/85x2yz+55/124xy2z+13641y3z+8/17x2z2+7817xyz2-2746y2z2+85/124xz3+87yz3+13182z4+109/93x2yu-69/17xy2u+12089y3u+8769x2zu-53/36xyzu-14834y2zu+123/23xz2u+103/77yz2u-2344z3u-43/104x2u2-6198xyu2+47/115y2u2-39/19xzu2-29/24yzu2+51/89z2u2-65/37xu3-95/94yu3+11302zu3-53/57u4-2874x2yv+4347xy2v-25/77y3v+13819x2zv+29/34xyzv+474y2zv+33/107xz2v-3517yz2v+10617z3v+1834x2uv+54/113xyuv-8751y2uv+111/70xzuv-66/61yzuv+9195z2uv-14289xu2v-13/110yu2v+103/9zu2v+5113u3v+116/89x2v2+15142xyv2+13078y2v2-38/41xzv2-13/113yzv2-12824z2v2-57/11xuv2-114/17yuv2-125/31zuv2+11939u2v2+44/13xv3+56/69yv3+12/125zv3+643uv3+3530v4,-3454x2y-1285xy2-6182y3-8/69x2z+9/19xyz+64/49y2z+98/67xz2-13809yz2+21/44z3+77/47x2u+748xyu-41/77y2u+7318xzu+4217yzu+12562z2u-98/69xu2-14/85yu2+119/46zu2-61/121u3+5582x2v+108/77xyv-93/4y2v-65/49xzv-4135yzv+2477z2v+11114xuv+85/14yuv+51/125zuv-7572u2v-115/52xv2-7647yv2+4647zv2-5684uv2-1/55v3,3454x3-6645x2y-43/34xy2+14590y3+8/11x2z-117/112xyz+109/54y2z+6566xz2+23/57yz2-13078z3+95/61x2u+67/40xyu-4544y2u-95/72xzu-8/103yzu+100/77z2u+23/63xu2+69/61yu2-94/105zu2+8619u3+68/123x2v+8/117xyv+101/77y2v+124/125xzv+17/84yzv+23/67z2v+18/59xuv+3216yuv-77/59zuv-9/50u2v+96/109xv2-2491yv2+14089zv2+14067uv2-56/113v3;TestGRRes(Name, I); kill R, Name, @p;  "";
714
715  string Name = "ell.d7.g6"; int @p=31991; ring R = (@p),(x,y,z,u,v), dp;ideal I = 4971xy3+3/101y4-12318xy2z-12835y3z+97/98xyz2+63y2z2-8056xz3+23/91yz3-9662z4-7398xy2u+69/71y3u-53/68xyzu-49/67y2zu-113/122xz2u-9/61yz2u+71/88z3u+11358xyu2-38/29y2u2-10232xzu2+14490yzu2+2274z2u2+3501xu3+10427yu3-109/38zu3-99/5u4-6605xy2v-1555y3v-648xyzv-2083y2zv-61/41xz2v+75/17yz2v-69/55z3v-6104xyuv-9582y2uv+69/2xzuv-12551yzuv+47/49z2uv-118/13xu2v+34/105yu2v+105/41zu2v+6533u3v+122/25xyv2+2/43y2v2+16/61xzv2+11524yzv2+113/99z2v2-71/26xuv2+7809yuv2-4865zuv2-2122u2v2+53/118xv3-13209yv3-11106zv3-49/79uv3+3006v4,xy3+15492y4-13742xy2z+112/117y3z+6/47xyz2+28/41y2z2+71/111xz3+49/57yz3-61/44z4-11759xy2u+4242y3u-109/18xyzu+2260y2zu-6873xz2u-41/112yz2u+12574z3u-10939xyu2+119/38y2u2-62/33xzu2-3699yzu2+2651z2u2-13194xu3-15185yu3-11/116zu3-61/83u4-10094xy2v+13/4y3v-74/73xyzv+43/20y2zv-11547xz2v+53/43yz2v-92/93z3v+32/41xyuv+118/33y2uv-121/39xzuv-15913yzuv+53/11z2uv+97/76xu2v+85/29yu2v-5183zu2v+8520u3v+121/28xyv2+64/51y2v2-15810xzv2+1/43yzv2-6160z2v2+13988xuv2+9/40yuv2+123/4zuv2+15024u2v2+73/95xv3+80/97yv3+57/25zv3-109/81uv3-121/87v4,-4971x2+14389xy+1607y2+59/119xz+12020yz+103/122z2+8894xu+7091yu+54/19zu-50/77u2+28/25xv-113/56yv+68/29zv-14620uv+79/107v2;TestGRRes(Name, I); kill R, Name, @p;  "";
716
717  string Name = "k3.d7.g5"; int @p=31991; ring R = (@p),(x,y,z,u,v), dp;ideal I = -97/108x2y-31/118xy2-73/61y3-79/14x2z-15930xyz-2324y2z+1842xz2+656yz2-8852z3-89/38x2u-102/43xyu+14719y2u+70/67xzu+7335yzu+27/56z2u-10744xu2-55/83yu2+120/73zu2+120/61u3-126/125x2v+691xyv-15385y2v+117/16xzv-17/97yzv+80/121z2v-48/119xuv+21/34yuv-103/65zuv-49/32u2v-41/42xv2+11/75yv2-502zv2-7583uv2+26/69v3,97/108x3+77/114x2y+71/21xy2+13679y3-1645x2z-1/33xyz-79/7y2z-52/53xz2+11940yz2-5800z3+109/13x2u-115/64xyu-125/56y2u-2365xzu+2103yzu+56/87z2u-84/79xu2+107/106yu2-79/70zu2-419u3+5354x2v+92/53xyv-32/19y2v+11/74xzv+4193yzv+45/79z2v-113/72xuv+17/71yuv+11164zuv-17/33u2v+103/66xv2+55/79yv2+118/15zv2-2646uv2+57/106v3,x3-61/113x2y-64/21xy2-107/8y3-13/60x2z+43/35xyz+41/114y2z-13683xz2-5829yz2+71/38z3+90/17x2u-39/29xyu+42/5y2u-61/55xzu+111/77yzu-87/100z2u+10735xu2-83/91yu2-4884zu2-7965u3-65/12x2v+109/86xyv+10606y2v-14164xzv-6678yzv+83/18z2v-93/10xuv+120/49yuv-1592zuv-8710u2v-73/57xv2+10762yv2-2956zv2-89/63uv2-12/7v3;TestGRRes(Name, I); kill R, Name, @p;  "";
718
719  string Name = "rat.d8.g6"; int @p=31991; ring R = (@p),(x,y,z,u,v), dp;ideal I = -19/125x2y2-87/119xy3-97/21y4+36/53x2yz+2069xy2z-59/50y3z-65/33x2z2-14322xyz2+79/60y2z2-9035xz3-14890yz3+87/47z4-23/48x2yu+45/44xy2u+1972y3u+79/118x2zu-5173xyzu+115/121y2zu+1239xz2u-115/17yz2u-15900z3u-78/95x2u2+67/101xyu2-12757y2u2+12752xzu2+68/21yzu2+103/90z2u2-12917xu3+97/92yu3-24/49zu3-13/79u4-51/61x2yv-3103xy2v+77/117y3v+73/115x2zv-79/33xyzv+123/110y2zv+11969xz2v-31/95yz2v-123/95z3v-105/124x2uv+12624xyuv+2/63y2uv+6579xzuv+13/62yzuv+4388z2uv-12747xu2v-26/105yu2v-78/61zu2v-125/53u3v-5/71xyv2+62/77y2v2+21/44xzv2-9806yzv2+3/91z2v2+361xuv2+568yuv2+2926zuv2+53/38u2v2-14523yv3+2082zv3+113/115uv3,108/73x2y2+4028xy3+38/43y4-1944x2yz+39/80xy2z+8/109y3z+52/27x2z2+103/45xyz2+5834y2z2+63/101xz3+107/80yz3+1178z4-1/6x2yu+78/25xy2u-21/43y3u+50/71x2zu-14693xyzu+15074y2zu+9/103xz2u-7396yz2u-14493z3u+93/25x2u2+61/4xyu2-11306y2u2-79/81xzu2+59/82yzu2-5/106z2u2+89/71xu3-34/11yu3+15/103zu3-115/52u4-54/65x2yv+67/16xy2v-7/68y3v-10/13x2zv+32/85xyzv+1/91y2zv+107/118xz2v+7594yz2v-98/103z3v+9919x2uv-965xyuv+53/34y2uv+119/11xzuv-3400yzuv-8329z2uv+75/98xu2v-24yu2v+55/87zu2v-82/71u3v-73/115x2v2+85/19xyv2-213y2v2-7704xzv2-15347yzv2+14960z2v2+15065xuv2-125/17yuv2+32/83zuv2-14/73u2v2-21/44xv3+79/2yv3-61/32zv3+46/119uv3-2082v4,9/20x2y2+113/71xy3-88/65y4+9983x2yz-6722xy2z+87/68y3z+1893x2z2+65/32xyz2+51/55y2z2-102/53xz3+58/5yz3-7187z4-96/7x2yu-14/87xy2u-3532y3u+95/54x2zu+19/65xyzu-6728y2zu+31/121xz2u+73/106yz2u-91/5z3u-12928x2u2+707xyu2-55/48y2u2-96/25xzu2+15869yzu2-20/107z2u2-10030xu3-13786yu3-122/9zu3+19/59u4-7/52x2yv+101/74xy2v+83/6y3v-91/55x2zv-5266xyzv+85/61y2zv+126/95xz2v+56/51yz2v+13073z3v-50/21x2uv-13553xyuv-116/53y2uv+68/71xzuv-111/98yzuv-11037z2uv+68/121xu2v-124/53yu2v+54/55zu2v+5862u3v+12318x2v2-119/29xyv2+101/17y2v2-51/40xzv2-82/33yzv2-30/41z2v2-29/52xuv2+7817yuv2+8121zuv2-28/99u2v2+1125xv3-73/55yv3-14141zv3+8742uv3-1203v4,x2y2+11357xy3+295y4+144x2yz-31/54xy2z+89/119y3z+1/46x2z2+29/26xyz2+1384y2z2+1461xz3+113/91yz3+9494z4-7/32x2yu+12850xy2u-3626y3u-33/106x2zu-7/60xyzu-5935y2zu-8597xz2u+5527yz2u+1708z3u+6182x2u2-15780xyu2+4669y2u2-38/69xzu2+8412yzu2+9265z2u2-5679xu3-67/18yu3-34/67zu3-7178u4+113/56x2yv-3669xy2v+17/113y3v-87/35x2zv-4871xyzv-111/11y2zv-1131xz2v-72/13yz2v+838z3v-115/4x2uv+3395xyuv-43/68y2uv-82/13xzuv+7042yzuv-88/119z2uv+100/19xu2v+24/11yu2v+89/3zu2v+7395u3v-119/109x2v2+1/104xyv2+18/25y2v2+700xzv2-59/9yzv2-92/87z2v2+2486xuv2-67/103yuv2+1469zuv2-101/91u2v2-79/33xv3+10838yv3+81/4zv3-11843uv3+7204v4,19/125x3-15698x2y-22/117xy2-95/107y3+2027x2z-7750xyz+85/104y2z-15326xz2+31/101yz2+67/81z3-7879x2u-112/115xyu+124/81y2u+99/61xzu-7458yzu+40/33z2u-1502xu2+6591yu2-7/73zu2-42/95u3+93/83x2v-15/112xyv-84/95y2v+35/36xzv+5/24yzv-12768z2v+13232xuv-76/103yuv-79/52zuv-7217u2v+75/92xv2-49/64yv2+17/14zv2-6109uv2+1695v3;TestGRRes(Name, I); kill R, Name, @p; "";
720
721  string Name = "k3.d14.g19"; int @p=31991; ring R = (@p),(x,y,z,u,v), dp;ideal I = 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I); kill R, Name, @p;  "";
722
723  string Name = "k3.d11.g11.ss0"; int @p=31991; ring R = (@p),(x,y,z,u,v), dp;ideal I = 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I); kill R, Name, @p; "";
724
725  string Name = "ell.d10.g9"; int @p=31991; ring R = (@p),(x,y,z,u,v), dp;ideal I = 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I); kill R, Name, @p; "";
726
727  string Name = "k3.d10.g9.quart2"; int @p=31991; ring R = (@p),(x,y,z,u,v), dp;ideal I = 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I); kill R, Name, @p; "";
728
729  string Name = "rat.d10.g9.quart2"; int @p=31991; ring R = (@p),(x,y,z,u,v), dp;ideal I = 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I); kill R, Name, @p; "";
730
731//  if( defined(assumeLevel0) ){ assumeLevel = assumeLevel0; } else { kill assumeLevel; } // restore the state of aL
732}
733
734/////////////////////////////////////////////////////////
735
736// Q@Woflram?
737proc grzero()
738"USAGE:  grzero()
739RETURN:  graded object representing S(0)^1
740PURPOSE: compute presentation of S(0)^1
741EXAMPLE: example grzero; shows an example
742"
743{
744 return ( grobj(module([0]), intvec(0), intvec(0)) );
745}
746example
747{ "EXAMPLE:"; echo = 2;
748
749  ring r=32003,(x,y,z),dp;
750
751  def M = grpower( grshift( grzero(), 10), 5 );
752
753  print(M);
754
755  grview(M);
756}
757
758proc grpower(def A, int p)
759"USAGE:  grpower(A, p), graded object A, int p > 0
760RETURN:  graded direct power A^p
761PURPOSE: compute the graded direct power A^p
762NOTE:    the power p must be positive
763EXAMPLE: example grpower; shows an example
764"
765{
766  if(p==0){ ERROR("Sorry, we don't know what is A^0!?!?"); } // grzero!?
767
768  ASSUME(0, p > 0);
769  ASSUME(1, grtest(A) );
770
771  if(p==1){ return(A); }
772
773  def N = grsum(A,A);
774
775  if(p==2){ return(N); }
776
777  // TODO: replace recursion with a loop!
778  // see http://en.wikipedia.org/wiki/Exponentiation_by_squaring
779  if((p%2)==0)
780    { return ( grpower(N, p div 2) ); }
781  else
782    { return ( grsum( A, grpower(N, (p-1) div 2) )); }
783}
784example
785{ "EXAMPLE:"; echo = 2;
786
787  ring r=32003,(x,y,z),dp;
788
789  module A = grobj( module([x+y, x, 0], [0, x+y, y]), intvec(1,1,1) );
790  grview(A);
791
792  module B = grobj( module([x,y]), intvec(2,2) );
793  grview(B);
794
795  module D = grsum( grpower(A,2), grpower(B,2) );
796
797  print(D);
798  homog(D);
799  grview(D);
800}
801
802
803proc grsum(A,B)
804"USAGE:  grsum(A, B), graded objects A and B
805RETURN:  graded direct sum of input objects
806PURPOSE: compute the graded direct sum of A and B
807EXAMPLE: example grsum; shows an example
808"
809{
810  ASSUME(1, grtest(A) );
811  ASSUME(1, grtest(B) );
812
813  intvec a = grrange(A);
814  intvec b = grrange(B);
815  intvec c = a,b;
816  int r = nrows(A);
817
818  module T = align(module(B), r); //  T;  print(T);  nrows(T); // BUG!!!!
819  module S = module(A), T;
820
821  intvec da = grdeg(A);
822  intvec db = grdeg(B);
823  intvec dc = da, db;
824
825  return(grobj(S, c, dc));
826}
827example
828{ "EXAMPLE:"; echo = 2;
829
830//  if( defined(assumeLevel) ){ int assumeLevel0 = assumeLevel; } else { int assumeLevel; export(assumeLevel); }; assumeLevel = 5;
831
832  ring r=32003,(x,y,z),dp;
833
834  module A = grobj( module([x+y, x, 0, 0], [0, x+y, y, 0]), intvec(0,0,0,1) );
835  grview(A);
836
837  module B = grobj( module([0,x,y]), intvec(15,1,1) );
838  grview(B);
839
840  module C = grsum(A,B);
841
842  print(C);
843  homog(C);
844  grview(C);
845
846  module D = grsum(
847     grsum(grpower(A,2), grtwist(1,1)),
848     grsum(grtwist(1,2), grpower(B,2))
849     );
850
851  print(D);
852  homog(D);
853  grview(D);
854
855  module F = grobj( module([x,y,0]), intvec(1,1,5) );
856  grview(F);
857
858  module T = grsum( F, grsum( grtwist(1, 10), B ) );
859  grview(T);
860
861//  if( defined(assumeLevel0) ){ assumeLevel = assumeLevel0; } else { kill assumeLevel; } // restore the state of aL
862}
863
864proc grshift( def M, int d)
865"USAGE:  grshift(A, d), graded objects A, int d
866RETURN:  shifted graded object
867PURPOSE: shift the grading on A by d: A_i -> A_{i+/-d}?
868EXAMPLE: example grshift; shows an example
869"
870{
871  ASSUME(1, grtest(M) );
872
873  intvec a = grrange(M);
874  a = a - intvec(d:size(a));
875
876  intvec t = attrib(M, "degHomog");
877  t = t - intvec(d:size(t));
878
879  return (grobj(M, a, t));
880}
881example
882{ "EXAMPLE:"; echo = 2;
883
884  ring r=32003,(x,y,z),dp;
885
886  module A = grobj( module([x+y, x, 0, 0], [0, x+y, y, 0]), intvec(0,0,0,1) );
887
888  grview(A);
889
890  module S = grshift( A,  6);
891
892  grview(S);
893}
894
895
896proc grisequal (def A, def B)
897"USAGE:  grisequal(A, B), graded objects A and B
898RETURN:  1 if A == B as graded objects, 0 otherwise
899PURPOSE: test the equality of two graded object
900NOTE: A and B should be literarly the same at the moment. TODO?
901EXAMPLE: example grisequal; shows an example
902"
903{
904  ASSUME(1, grtest(A) );
905  ASSUME(1, grtest(B) );
906
907  int ra = nrows(A);
908  int rb = nrows(B);
909
910  intvec wa = grrange(A);
911  intvec wb = grrange(B);
912
913  if( (ra != rb) || (ncols(A) != ncols(B)) ){ return (0); } // TODO: ???
914
915  intvec da = grdeg(A);
916  intvec db = grdeg(B);
917
918  return ( (da == db) && (wa == wb) &&
919           (size(module(matrix(A) - matrix(B))) == 0)    ); // TODO: ???
920}
921example
922{ "EXAMPLE:"; echo = 2;
923  TODO
924}
925
926proc grtwist(int a, int d)
927"USAGE:  grtwist(a,d), int a, d
928RETURN:  graded object representing S(d)^a
929PURPOSE: compute presentation of S(d)^a
930EXAMPLE: example grtwist; shows an example
931"
932{
933  ASSUME(0, a > 0);
934
935  module Z; Z[a] = [0];
936  intvec w = -intvec(d:a);
937  Z = grobj(Z, w, w); // will set the rank as well
938  ASSUME(2, grisequal(Z, grpower( grshift(grzero(), d), a ) )); // optional check
939  return(Z);
940}
941example
942{ "EXAMPLE:"; echo = 2;
943
944  ring r=32003,(x,y,z),dp;
945
946  grview(grpower( grshift(grzero(), 10), 5 ) );
947
948  grview( grtwist (5, 10) );
949}
950
951proc grobj(def A, intvec w, list #)
952"USAGE:  grobj(M, w[, d]), matrix/ideal/module M, intvec w, d
953RETURN:  graded object with matrix presentation M, row weighting w [and total graded degrees d of columns]
954PURPOSE: create a valid graded object with a given matrix presentation, weighting [and total graded degrees (in case of zero columns)]
955EXAMPLE: example grobj; shows an example
956"
957{
958  module M = module(A);
959  ASSUME(0, size(w) >= nrows(M) );
960
961  attrib( M, "rank", size(w) );
962  attrib( M, "isHomog", w );
963
964  if( size(#) > 0 )
965  {
966    ASSUME(0, typeof(#[1]) == "intvec" );
967    ASSUME(0, size(#[1]) == ncols(M) );
968    attrib(M, "degHomog", #[1]);
969  }
970  else
971  {
972    ASSUME(0, /* no zero cols please! */ size(M) == ncols(M) );
973    attrib(M, "degHomog", grdeg(M));
974  }
975
976  ASSUME(0, grtest(M) );
977  return (M);
978}
979example
980{ "EXAMPLE:"; echo = 2;
981
982  ring r=32003,(x,y,z),dp;
983
984  module A = grobj( module([x+y, x, 0, 0], [0, x+y, y, 0]), intvec(0,0,0,1) );
985  grview(A);
986
987  module F = grobj( module([x,y,0]), intvec(1,1,5) );
988  grview(F);
989
990  int d = 666; // zero can have any degree...
991  module Z = grobj( module([x,0], [0,0,0], [0, y]), intvec(1,2,3), intvec(2, d, 3) );
992  grview(Z);
993
994  print(Z);
995  attrib(Z);
996  grrange(Z); // module weights
997  attrib(Z, "degHomog"); // total degrees
998
999}
1000
1001proc grtest(def N, list #)
1002"USAGE:  grtest(M[,b]), anyting M, optionally int b
1003RETURN:  1 if M is a valid graded object, 0 otherwise
1004PURPOSE: validate a graded object. Print an invalid object message if b is not given
1005NOTE: M should be an ideal or module or matrix, with weighting attribute
1006   'isHomog' and optionally total graded degrees attribute 'degHomog'.
1007   Attributes should be compatible with the presentation matrix.
1008EXAMPLE: example grtest; shows an example
1009"
1010{
1011  int b = (size(#) == 0);
1012  string t = typeof(N);
1013  if( (t != "ideal") && (t != "module") && (t != "matrix") )
1014  {
1015    if(b) { "   ? grtest: Input should be something like a matrix!"; };
1016    return (0);
1017  };
1018
1019  if ( typeof(grrange(N)) != "intvec" )
1020  {
1021    if(b) { type(N); attrib(N); "   ? grtest: Input must be graded!";  };
1022    return (0);
1023  };
1024
1025  intvec gr = grrange(N); // grading weights...
1026  if ( nrows(N) != size(gr) )
1027  {
1028    if(b) { "   ? grtest: Input has wrong number of rows!"; };   
1029    return (0);
1030  };
1031
1032//  if( attrib(N, "rank") != size(gr) ){ return (0); } // wrong rank :(
1033
1034  if ( typeof(attrib(N, "degHomog")) == "intvec" )
1035  {
1036    intvec T = attrib(N, "degHomog"); // graded degrees
1037   
1038    if ( ncols(N) != size(T) )
1039    {
1040      if(b) { "   ? grtest: Input has wrong number of cols!"; };   
1041      return (0);
1042    };
1043   
1044    int k = nvars(basering) + 1; // index of mod. column in the leadexp
1045
1046    module L = lead(module(N)); vector v;
1047
1048    // checking T for non-zero N[i]
1049    int i = size(T);
1050
1051    for (; i > 0; i-- )
1052    {
1053      v = L[i];
1054      if( v != 0 )
1055      {
1056        if( (deg(v) + gr[ leadexp(v)[k] ]) != T[i] )
1057        {
1058          if(b) { "   ? grtest: Input has wrong total grade of " + string(i) + "-th column!"; };
1059          return (0);
1060        };  // wrong T[i]
1061      }
1062    }
1063
1064    // TODO: check t on nonzero cols...
1065  } else
1066  {
1067    if( ncols(N) != size(N) )
1068    {
1069      if(b) { "   ? grtest: Input should have exclusively non-zero columns, please give total grades otherwise!"; };
1070      return (0);
1071    };
1072  }
1073
1074  if( !homog(N) )
1075  {
1076    if(b) { "   ? grtest: Input should be graded homogenous!"; };
1077    return (0);
1078  };
1079
1080//  if(b) { "Input seems to be a valid graded object (map)!"; };
1081  return (1);
1082}
1083example
1084{ "EXAMPLE:"; echo = 2;
1085
1086  ring r=32003,(x,y,z),dp;
1087
1088  // the following calls will fail due to tests in grtest:
1089
1090// grobj( module([x+y, x, 0, 0], [0, x+y, y, 0]), intvec(0,0) ); // not enough row weights
1091// grobj( module([x,0], [0,0,0], [0, y]), intvec(1,2,3) ); // zero column needs (otherwise optional) total degrees
1092// grobj( module([x,0], [0,0,0], [0, y]), intvec(1,2,3), intvec(1, 1, 1) ); // incompatible total degrees (on non-zero columns)
1093
1094}
1095
1096
1097static proc align( def A, int d)
1098"analog of align kernel command for older Singular versions
1099 this is static since it should not be used by @code{align}-able (newer)
1100 Singular releases.
1101 Note that this proc does not care about any attributes (of A)
1102"
1103{
1104  module T; T[d] = 0;
1105  T = T, module(transpose(A));
1106  return( module(transpose(T)) );
1107}
1108
1109proc grgroebner(A)
1110"USAGE:  grgroebner(M), graded object M
1111RETURN:  graded object
1112PURPOSE: compute graded groebner basis of M
1113EXAMPLE: example grgroebner; shows an example
1114"
1115{
1116  ASSUME(1, grtest(A));
1117
1118  return ( grobj( groebner(A), grrange(A) ) );
1119}
1120example
1121{ "EXAMPLE:"; echo = 2;
1122
1123  ring r=32003,(x,y,z),dp;
1124
1125  module A = grobj( module([x+y, x, 0, 0], [0, x+y, y, 0]), intvec(0,0,0,1) );
1126  grview(A);
1127 
1128  module B = grgroebner(A);
1129  grview(B);
1130}
1131
1132
1133proc grtwists(intvec v)
1134"USAGE:  grtwists(v), intvec v
1135RETURN:  graded object representing S(v[1]) + ... + S(v[size(v)])
1136PURPOSE: compute presentation of S(v[1]) + ... + S(v[size(v)])
1137EXAMPLE: example grtwists; shows an example
1138"
1139{
1140  int l = size(v);
1141  module Z; Z[l] = [0];
1142  Z = grobj(Z, v, v); // will set the rank as well
1143  return(Z);
1144}
1145example
1146{ "EXAMPLE:"; echo = 2;
1147
1148  ring r=32003,(x,y,z),dp;
1149 
1150  grview( grtwists ( intvec(-4, 1, 6 )) );
1151}
1152
1153
1154proc grsyz(A)
1155"USAGE:  grsyz(M), graded object M
1156RETURN:  graded object
1157PURPOSE: compute graded syzygy of M
1158EXAMPLE: example grsyz; shows an example
1159"
1160{
1161  ASSUME(1, grtest(A));
1162  intvec v = grdeg(A);
1163
1164//  grrange(A);
1165 
1166  module M = syz(A);
1167//  print(M);
1168 
1169  if( size(M) > 0 ) { return( grobj( M, v ) ); }
1170
1171  // zero syzygy?
1172  return( grtwists(v) ); // ???
1173}
1174example
1175{ "EXAMPLE:"; echo = 2;
1176
1177  ring r=32003,(x,y,z),dp;
1178
1179  module A = grobj( module([x+y, x, 0, 3], [0, x+y, y, 2], [y, y, z, 1]), intvec(0,0,0,1) );
1180  grview(A);
1181 
1182  module B = grgroebner(A);
1183  grview(B);
1184
1185  module C = grsyz(B); 
1186  grview(C);
1187}
1188
1189
1190proc grprod(A, B)
1191"USAGE:  grprod(M, N), graded objects M and N
1192RETURN:  graded object
1193PURPOSE: compute graded product M * N (as composition of maps)
1194EXAMPLE: example grprod; shows an example
1195"
1196{
1197  ASSUME(1, grtest(A));
1198  ASSUME(1, grtest(B));
1199
1200  // TODO: ASSUME(0, grdeg() == grrange());!!!
1201
1202  return ( grobj( A*B, grrange(A), grdeg(B) ) );
1203}
1204example
1205{ "EXAMPLE:"; echo = 2;
1206
1207  ring r=32003,(x,y,z),dp;
1208
1209  module A = grobj( module([x+y, x, 0, 3], [0, x+y, y, 2], [y, y, z, 1]), intvec(0,0,0,1) );
1210  grview(A);
1211 
1212  A = grgroebner(A);
1213  grview(A);
1214 
1215  module B = grsyz(A);
1216  grview(B);
1217  print(B);
1218 
1219  module D = grprod( A, B );
1220  grview(D);
1221  print(D); // must be all zeroes due to syzygy property!
1222  ASSUME(0, size(D) == 0);
1223}
1224
1225
1226
1227
1228proc grres(def A, int l, list #)
1229"USAGE:  grres(M, l[, b]), graded object M, int l, int b
1230RETURN:  graded resolution = list of graded objects
1231PURPOSE: compute graded resolution of M (of length l) and minimise it if b was given                             
1232EXAMPLE: example grres; shows an example
1233"
1234{
1235  ASSUME(0, l >= 0);
1236  ASSUME(1, grtest(A));
1237
1238  intvec v = grrange(A);
1239 
1240  int b = (size(#) > 0);
1241  if(b) { list r = res(A, l, #[1]); } else { list r = res(A, l); }
1242
1243//  r;  v;
1244
1245  l = size(r);
1246 
1247  int i; module m;
1248 
1249  for ( i = 1; i <= l; i++ )
1250  {
1251    if( size(r[i]) == 0 ){ r[i] = grtwists(v); i++; break;   }
1252
1253    r[i] = grobj(r[i], v); v = grdeg(r[i]);
1254  }
1255  i = i-1;
1256
1257  return( list(r[1..i]) );
1258}
1259example
1260{ "EXAMPLE:"; echo = 2;
1261
1262  ring r=32003,(x,y,z),dp;
1263
1264  module A = grobj( module([x+y, x, 0, 3], [0, x+y, y, 2], [y, y, z, 1]), intvec(0,0,0,1) );
1265  grview(A);
1266 
1267  module B = grgroebner(A);
1268  grview(B);
1269
1270  "graded resolution of B: "; def C = grres(B, 0); grview(C);
1271
1272  int i; int l = size(C);
1273
1274  "D^2 == 0: "; for (i = 1; i < l; i++ ) { i; grview( grprod(C[i], C[i+1]) ); }
1275}
1276
1277proc grtranspose(def M)
1278"
1279USAGE:   grtranspose(M), graded object M
1280RETURN:  graded object
1281PURPOSE: graded transpose of M
1282NOTE:    no reordering is performend by this procedure   
1283EXAMPLE: example grtranspose; shows an example
1284"
1285{
1286  ASSUME(1, grtest(M) );
1287  return (  grobj(transpose(M), -grdeg(M), -grrange(M))  );
1288}
1289example
1290{ "EXAMPLE:"; echo = 2;
1291
1292  ring r=32003,(x,y,z),dp;
1293
1294  module M = grtwists( intvec(-2, 0, 4, 4) ); grview(M);
1295
1296  module N = grsyz( grtranspose( M ) ); grview(N);
1297
1298  module L = grtranspose(N); grview( L );
1299
1300  module K = grsyz( L ); grview(K);
1301 
1302
1303  module A = grobj( module([x+y, x, 0, 3], [0, x+y, y, 2], [y, y, z, 1]), intvec(0,0,0,1) ); A = grgroebner(A); grview(A);
1304
1305  "graded transpose: "; module B = grtranspose(A); grview( B ); print(B);
1306
1307  "... syzygy: "; module C = grsyz(B); grview(C);
1308
1309  "... transposed: "; module D = grtranspose(C); grview( D ); print (D);
1310
1311  "... and back to presentation: "; module E = grsyz( D ); grview(E); print(E);
1312
1313  module F = grgens( E ); grview(F); print(F);
1314 
1315  module G = grpres( F ); grview(G); print(G);
1316}
1317
1318
1319proc grgens(def M)
1320"
1321USAGE:   grgens(M), graded object M (map)
1322RETURN:  graded object 
1323PURPOSE: try compute graded generators of coker(M) and return them as columns
1324         of a graded map.
1325NOTE:    presentation of resulting generated submodule may be different to M!
1326EXAMPLE: example grgens; shows an example
1327"
1328{
1329  ASSUME(1, grtest(M) );
1330
1331  module N = grtranspose( grsyz( grtranspose(M) ) );
1332 
1333//  ASSUME(3, grisequal( grgroebner(M), grgroebner( grpres( N ) ) ) ); // FIXME: not always true!?
1334 
1335  return ( N );
1336}
1337example
1338{ "EXAMPLE:"; echo = 2;
1339
1340  ring r=32003,(x,y,z),dp;
1341
1342  module M = grtwists( intvec(-2, 0, 4, 4) ); grview(M);
1343
1344  module N = grgens(M);
1345 
1346  grview( N ); print(N); // fine == M
1347
1348
1349  module A = grobj( module([x+y, x, 0, 3], [0, x+y, y, 2], [y, y, z, 1]), intvec(0,0,0,1) );
1350
1351  A = grgroebner(A); grview(A);
1352
1353  module B = grgens(A);
1354
1355  grview( B ); print(B); // Ups :( != A
1356 
1357}
1358
1359
1360proc grpres(def M)
1361"
1362USAGE:   grpres(M), graded object M (submodule gens)
1363RETURN:  graded module (via coker)
1364PURPOSE: compute graded presentation matrix of submodule generated by columns of M
1365EXAMPLE: example grpres; shows an example
1366"
1367{
1368  ASSUME(1, grtest(M) );
1369
1370  module N = grsyz(M);
1371
1372//  ASSUME(3, grisequal( M, grgens( N ) ) );
1373 
1374  return ( N );
1375}
1376example
1377{ "EXAMPLE:"; echo = 2;
1378
1379  ring r=32003,(x,y,z),dp;
1380
1381  module M = grtwists( intvec(-2, 0, 4, 4) ); grview(M);
1382
1383  module N = grgens(M); grview( N ); print(N);
1384
1385  module L = grpres( N ); grview( L ); print(L);
1386
1387
1388  module A = grobj( module([x+y, x, 0, 3], [0, x+y, y, 2], [y, y, z, 1]), intvec(0,0,0,1) );
1389
1390  A = grgroebner(A); grview(A);
1391
1392  module B = grgens(A); grview( B ); print(B);
1393
1394  module C = grpres( B ); grview( C ); print(C);
1395}
1396
1397
1398
1399LIB "random.lib"; // for sparsepoly
1400
1401proc grrndmat(intvec w, intvec v, list #)
1402"USAGE:  grrndmat(src,dst[,p,b]), intvec src, dst[, int p, b]
1403RETURN:  matrix of polynomials
1404PURPOSE: generate random matrix compatible with src and dst gradings
1405NOTE:    optional arguments p, b are for 'sparsepoly' (by default: 75%, 30000).
1406TODO:    this is experimental at the moment!
1407EXAMPLE: example grrndmat; shows an example
1408"
1409{
1410  // defaults for sparsepoly
1411  int p = 75;
1412  int b = 30000;
1413
1414  if ( size(#) > 0 )
1415  {
1416    ASSUME( 0, (typeof(#[1]) == "int") || (typeof(#[1]) == "bigint") );
1417    p = #[1];
1418
1419    if ( size(#) > 1 )
1420    {
1421      ASSUME( 0, (typeof(#[2]) == "int") || (typeof(#[2]) == "bigint") );
1422      b = #[2];
1423    }
1424  }
1425
1426  int n = size(v); // destination: rows!
1427  int m = size(w); // source: cols
1428
1429  matrix M[n][m];
1430
1431  int r,c; intvec ww;
1432
1433  for( c = m; c > 0; c-- )
1434  {
1435    ww = v - intvec(w[c]:n);
1436    for( r = n; r > 0; r-- )
1437    {
1438      if( ww[r] >= 0)
1439      {
1440        M[r,c] = sparsepoly(ww[r], ww[r], p, b);
1441      }
1442
1443    }
1444  }
1445
1446  return(M);
1447}
1448example
1449{ "EXAMPLE:"; echo = 2;
1450
1451  ring r=32003,(x,y,z),dp;
1452
1453  print( grrndmat( intvec(0, 1), intvec(1, 2, 3) ) );
1454}
1455
1456//
1457
1458
1459proc KeneshlouMatrixPresentation(intvec a)
1460"
1461PURPOSE: Direct sum of all omegas_i(i) with powers a[i]
1462NOTE: Please document/name this proc properly
1463"
1464{
1465  int n = size(a)-1;
1466  //  ring r = 32003,(x(0..n)),dp;
1467  ASSUME(0, nvars(basering)==(n+1));
1468  int i,j;
1469
1470  // find first nonzero exponent a_i
1471  for(i=1;i<=size(a);i++)
1472    {
1473      if(a[i]!=0) {break; };
1474    }
1475
1476  // all zeroes?
1477  if(i>size(a)) {return (grzero()); };
1478
1479  for(i=2;i<=n;i++)
1480    {
1481      if(a[i]!=0) {break; };
1482    }
1483
1484  module N;
1485
1486  if(i>n)
1487    { // no middle part
1488      if(a[1]>0)
1489        {
1490          N=grtwist(a[1],0);
1491
1492          if(a[n+1]>0)
1493            { N=grsum(N,grtwist(a[n+1],-1));}       
1494        } 
1495      else
1496        { N=grtwist(a[n+1],-1);}
1497     
1498      return (N); // grorder(N));
1499    }
1500  else // i <= n: middle part is present, a_i != 0
1501    { // a = a1  ... |  i:2, a_2 ..... i: n, a_n | .... i: n+1a_(n+1)
1502      j = i - 1;
1503      module I = maxideal(1); attrib(I,"isHomog", intvec(0)); list L = mres(I, 0); // TODO: use grres() instead!!!
1504      list kos = grorder(L);
1505      // make sure that graded maps  are represented by blocks corresponding to the betti diagram?
1506
1507      def S = grpower(grshift(grobj( kos[j+2], attrib(kos[j+2], "isHomog")), j), a[i]);
1508
1509      i++;
1510
1511      for(; i <= n; i++)
1512        {
1513          if(a[i]==0) { i++; continue; }
1514          j = i - 1;
1515          S = grsum( S, grpower(grshift( grobj( kos[j+2], attrib(kos[j+2], "isHomog")), j), a[i])  );
1516        }
1517
1518      // S is the middle (non-zero) part
1519
1520      if(a[1] > 0 )
1521        {
1522          N=grsum(grtwist(a[1],0), S);
1523        }
1524      else
1525        { N = S;}
1526
1527      if(a[n+1] > 0 )
1528        { N=grsum(N, grtwist(a[n+1],-1)); }
1529
1530
1531      return ((N)); //      return (grorder(N));
1532    }
1533}
1534example
1535{ "EXAMPLE:"; echo = 2;
1536  ring r = 32003,(x(0..4)),dp;
1537
1538  def N1 = KeneshlouMatrixPresentation(intvec(2,0,0,0,0));
1539  grview(N1);
1540
1541  def N2 = KeneshlouMatrixPresentation(intvec(0,0,0,0,3));
1542  grview(N2);
1543
1544  def N = KeneshlouMatrixPresentation(intvec(2,0,0,0,3));
1545  grview(N);
1546
1547
1548  def M1 = KeneshlouMatrixPresentation(intvec(0,1,0,0,0));
1549  grview(M1);
1550
1551  def M2 = KeneshlouMatrixPresentation(intvec(0,1,1,0,0));
1552  grview(M2);
1553
1554  def M3 = KeneshlouMatrixPresentation(intvec(0,0,0,1,0));
1555  grview(M3);
1556
1557  def M = KeneshlouMatrixPresentation(intvec(1,1,1,0,0));
1558  grview(M);
1559
1560
1561}
1562
1563proc grconcat(A,B)
1564"USAGE: grconcat(A, B), graded objects A and B, dst(A) == dst(B) =: dst
1565RETURN: graded object
1566PURPOSE: construct src(A) + src(B) -----> dst  given by (A|B)
1567EXAMPLE: example grconcat; shows an example
1568"
1569{
1570
1571  ASSUME(1, grtest(A));
1572  ASSUME(1, grtest(B));
1573  ASSUME(0, grrange(A)==grrange(B));
1574 
1575  intvec v = grrange(A);
1576  intvec w=grdeg(A),grdeg(B);
1577  return(grobj(concat(A,B),v,w));
1578}
1579example
1580{ "EXAMPLE:"; echo = 2;
1581  ring r;
1582 
1583  module R=grobj(module([x,y,z]),intvec(0:3));
1584  grview(R);
1585
1586  module S=grobj(module([x,0,y],[xy,zy+x2,0]),intvec(0:3));
1587  grview(S);
1588
1589  def Q=grconcat(R,S);
1590  grview(Q);
1591}
1592
1593
1594proc grlift(A, B)
1595"USAGE: grlift(M, N), graded objects M and N
1596RETURN: transformation matrix (graded object???)
1597PURPOSE: compute graded matrix which the generators of submodule Im(N) in terms of Im(M).
1598EXAMPLE: example grlift; shows an example
1599"
1600{
1601  ASSUME(1, grtest(A));
1602  ASSUME(1, grtest(B));
1603  ASSUME(0, grrange(A) == grrange(B));
1604
1605//  matrix T;  module AA = liftstd(A, T); //  AA = module(A*T)
1606//  matrix U;
1607  matrix L =lift(A,B/*,U*/);  //  module(B*U) = module(matrix(A)*L)
1608 
1609  return(grobj(L, grdeg(A), grdeg(B)));
1610}
1611example
1612{ "EXAMPLE:"; echo = 2;
1613
1614  ring r=32003,(x,y,z),dp;
1615  module P=grobj(module([xy,0,xz]),intvec(0,1,0));
1616  grview(P);
1617
1618
1619  module D=grobj(module([y,0,z],[x2+y2,z,0]),intvec(0,1,0));
1620  grview(D);
1621
1622  def G=grlift(D,P);
1623  grview(G);
1624
1625  ASSUME(0, grisequal( grprod(D, G), P) ); 
1626}
1627
1628proc grrange(M)
1629{
1630//  ASSUME(1, grtest(M)); // Leads to recursive call due to grtest...
1631  return( attrib(M, "isHomog") );
1632}
1633
1634proc grlift0(M, N, alpha1)
1635"PURPOSE: generic random alpha0 : coker(M) -> coker(N) from random alpha1
1636NOTE: this proc can work only if some assumptions are fulfilled (due
1637to Wolfram)! e.g. at the end of a resolution for the source module...
1638"
1639{
1640
1641  ASSUME(1, grtest(M));
1642  ASSUME(1, grtest(N));
1643
1644  ASSUME(0, grdeg(M) == grdeg(alpha1) );
1645  ASSUME(0, grdeg(N) == grrange(alpha1) );
1646  return(
1647   grtranspose( grlift( grtranspose( M ),
1648       grtranspose( grprod( N,  alpha1 ) ) )
1649       ) ); // alpha0!
1650   
1651}
1652example
1653{ "EXAMPLE:"; echo = 2;
1654
1655  ring S = 0, (x(0..3)), dp;
1656  list kos = grres(grobj(maxideal(1), intvec(0)), 0);
1657  print( betti(kos), "betti");
1658  grview(kos);
1659
1660
1661  // source module:
1662//  module M = grshift(kos[4], 2); // phi, Syz_3(K(2))
1663  def M = KeneshlouMatrixPresentation(intvec(0,0,1,0));
1664//   grview( grres(M, 0) );
1665  grview(M);
1666
1667  // destination module:
1668//   module N = grshift(kos[3], 1); // psi, Syz_2(K(1))
1669  def N = KeneshlouMatrixPresentation(intvec(0,1,0,0));
1670//  grview( grres(N, 0) );
1671  grview(N);
1672
1673  // random graded of degree 0, homomorphism of free presentations:
1674  // alpha1: src(M) -> src (N)
1675  def alpha1 = grrndmap( M, N ); // alpha1
1676  grview(alpha1);
1677
1678  // random graded of degree 0, homomorphism of free presentations:
1679  // alpha0: dst(M) -> dst (N)
1680  def alpha0 = grlift0(M, N, alpha1);
1681  grview(alpha0);
1682
1683}
1684
1685
1686proc grlifting(M,N)
1687"generic random alpha : coker(M) -> coker(N) "
1688{  ASSUME(1, grtest(M));
1689   ASSUME(1, grtest(N));
1690
1691   list rM=grres(M,0,1);
1692   list rN=grres(N,0,1);
1693   int i,j,k;
1694
1695  for(i=1;i<=size(rM);i++)
1696  {
1697    if(size(rM[i])==0){break;}
1698  }
1699
1700  for(j=1;j<=size(rN);j++)
1701  {
1702    if(size(rN[j])==0){break;}
1703  }
1704  int t=min(i,j);
1705
1706  ASSUME(0, t >= 2);
1707 
1708  list P;
1709
1710  "t: ", t;
1711 
1712  P[1]= grrndmap( rM[1], rN[1] ); // alpha1
1713
1714  grview(P[1]); print(P[1]); 
1715
1716//   return();
1717 
1718 
1719  for(k=2; k<=t; k++)
1720  {
1721    "k: ", k;
1722    grview(rN[k-1]);
1723    grview(P[k-1]);
1724
1725//    grprod( grtranspose(P[k-1]), grtranspose(rN[k-1])  );
1726//    grprod( grtranspose(rN[k-1]), grtranspose(P[k-1])  );
1727
1728//     grprod( P[k-1], rN[k-1] );
1729   
1730//    grview( _ );
1731   
1732//    rM[k];
1733    grview(rM[k-1]);
1734
1735    P[k] =  grtranspose( grlift( grtranspose( rM[k-1] ),
1736       grtranspose( grprod( rN[k-1],  P[k-1] ) ) ) ); // alpha0!
1737   
1738//    P[k] = grlift( grprod(P[k-1],rM[k]), rN[k] ); // ??
1739    grview(P[k]); 
1740   
1741  }
1742     
1743  return(P);
1744   
1745}
1746example
1747{ "EXAMPLE:"; echo = 2;
1748/*
1749  ring r=32003,(x,y,z),dp;
1750
1751  module P=grobj(module([xy,0,xz]),intvec(0,1,0));
1752  grview(P);
1753
1754  module D=grobj(module([y,0,z],[x2+y2,z,0]),intvec(0,1,0));
1755  grview(D);
1756
1757  def G=grlifting(D,P);
1758  grview(G);
1759
1760  kill r;
1761  ring r=32003,(x,y,z),dp;
1762
1763  module D=grobj(module([y,0,z],[x2+y2,z,0], [z3, xy, xy2]),intvec(0,1,0));
1764  D = grgroebner(D);
1765  grview( grres(D, 0));
1766
1767  def G=grlifting(D, D);
1768  grview(G);
1769*/
1770
1771  ring S = 0, (x(0..3)), dp;
1772  list kos = grres(grobj(maxideal(1), intvec(0)), 0);
1773  print( betti(kos), "betti");
1774  grview(kos);
1775
1776//  module M = grshift(kos[4], 2); // phi, Syz_3(K(2))
1777  def M = KeneshlouMatrixPresentation(intvec(0,0,1,0));
1778  grview( grres(M, 0) );
1779 
1780//   module N = grshift(kos[3], 1); // psi, Syz_2(K(1))
1781  def N = KeneshlouMatrixPresentation(intvec(0,1,0,0));
1782  grview( grres(N, 0) );
1783
1784  grlifting(M, N); // grview(G);
1785
1786
1787//  def G=grlifting( grgens(M), grgens(N) );  grview(G);
1788
1789
1790}
1791
1792proc mappingcone(M,N)
1793"??"
1794{
1795  ASSUME(1, grtest(M));
1796  ASSUME(1, grtest(N));
1797
1798  list P=grlifting(M,N);
1799  list rM=grres(M,1);
1800  list rN=grres(N,1);
1801
1802  int i;
1803  list T;
1804
1805  T[1]=grconcat(P[1],rN[2]);
1806
1807  for(i=2;i<=size(P);i++)
1808  {
1809    intvec v=grrange(rM[i]);
1810    intvec w=grdeg(rN[i+1]);
1811    int r=size(v);
1812    int s=size(w);
1813    module zero = (0:s);
1814
1815    module A=grconcat(P[i],rN[i+1]);
1816    module B=grobj(zero,v,w);
1817    module C=grconcat(-rM[i],B);
1818    module D=grconcat(grtranspose(C), grtranspose(A));
1819
1820    T[i]=grtranspose(D);
1821  }
1822   return(T);
1823}
1824example
1825{ "EXAMPLE:"; echo = 2;
1826
1827ring r=32003, (x(0..4)),dp;
1828def I=maxideal(1);
1829module R=grobj(module(I), intvec(0));
1830resolution FR=mres(R,0);
1831print(betti(FR,0),"betti");
1832module K=grobj(module(FR[1]),intvec(-1),intvec(0,0,0,0,0));
1833module S=grsyz(K);
1834grview(S);
1835module B=grobj(module([1,0,0],[0,1,0],[0,0,1]),intvec(1,1,1),intvec(1,1,1));
1836grview(B);
1837
1838def Z=grlifting(B,S);
1839Z;
1840
1841def G=mappingcone(B,S);
1842G;
1843
1844
1845resolution E=grres(G[1],0);
1846print(betti(E,0),"betti");
1847module W=grtranspose(G[1]);
1848resolution U=grres(W,0);
1849ideal P=groebner(flatten(U[2])); // flatten???
1850resolution L=mres(P,0);
1851print(betti(L),"betti");
1852}
1853
1854// correct
1855proc grrndmap(def S, def D, list #)
1856"USAGE: (S,D), graded objects S and D
1857RETURN: graded object
1858PURPOSE: construct a random 0-deg graded homomorphism src(S) -> src(D)
1859EXAMPLE: example grrndmap; shows an example
1860"
1861{
1862
1863ASSUME(1, grtest(S) );
1864ASSUME(1, grtest(D) );
1865
1866// "src: "; grview(S);"dst: "; grview(D);
1867
1868intvec v = -grdeg(S); // source
1869intvec w = -grdeg(D); // destination
1870
1871return (grobj(grrndmat(v, w, #), -w, -v ) );
1872}
1873example
1874{ "EXAMPLE:"; echo = 2;
1875
1876  ring r=32003,(x,y,z),dp;
1877
1878  module D=grobj(module([y,0,z],[x2+y2,z,0]),intvec(0,1,0));
1879  grview(D);
1880
1881  module S=grobj(module([x,0,y],[xy,zy+x2,0]),intvec(0,0,0));
1882  grview(S);
1883
1884  def H=grrndmap(D,S);
1885  grview(H);
1886
1887}
1888
1889
1890proc grrndmap2(def D, def S, list #)
1891"USAGE: (D,S), graded objects S and D
1892RETURN: graded object
1893PURPOSE: construct a random 0-deg graded homomorphism between target of D and S.
1894EXAMPLE: example grrndmap2; shows an example
1895"
1896{
1897  ASSUME(1, grtest(D) );
1898  ASSUME(1, grtest(S) );
1899  intvec v = -grrange(D); // source
1900  intvec w = -grrange(S); // target
1901  return (grobj(grrndmat(v, w, #), -w, -v ) );
1902}
1903example
1904{ "EXAMPLE:"; echo = 2;
1905
1906  ring r=32003,(x,y,z),dp;
1907
1908  module D=grobj(module([y,0,z],[x2+y2,z,0]),intvec(0,1,0));
1909  grview(D);
1910
1911  module S=grobj(module([x,0,y],[xy,zy+x2,0]),intvec(0,0,0));
1912  grview(S);
1913
1914  def G=grrndmap2(D,S);
1915  grview(G);
1916
1917}
1918
1919proc grlifting2(A,B)
1920"USAGE: (A,B), graded objects A and B (matrices defining maps)
1921RETURN: map of chain complexes (as a list)
1922PURPOSE: construct a map of chain complexes between free resolution of
1923M=coker(A) and N=coker(B).
1924NOTE:
1925               A     f2     f3
19260<---M<----F0<----F1<----F2<----F3<----
1927             |p1   |p2
1928
19290<---N<----G0<----G1<----G2<----G3<----
1930               B(g1)      g2     g3
1931
1932EXAMPLE: example grlifting2; shows an example
1933"
1934{  ASSUME(1, grtest(A));
1935   ASSUME(1, grtest(B));
1936
1937   list rM=grres(A,0);
1938   list rN=grres(B,0);
1939   int i,j,k;
1940   list P;
1941
1942  // find first zero matrix in rM
1943  for(i=1;i<=size(rM);i++)
1944  {
1945    if(size(rM[i])==0){break;}
1946  }
1947
1948  // find first zero matrix in rN
1949  for(j=1;j<=size(rN);j++)
1950  {
1951    if(size(rN[j])==0){break;}
1952  }
1953
1954  int t=min(i,j);
1955
1956  P[1]=grrndmap2(A,B);
1957
1958  // A(or B)=0
1959  if(t==1){return(P[1])};
1960 
1961  for(k=2;k<=t;k++)
1962  {
1963   def E=grprod(P[k-1],rM[k-1]);
1964   P[k]=grlift(rN[k-1],E); // ---------->
1965   /* let yi=(pi)o(fi); to take grlift(gi,yi)
1966      we should have img(yi) is contained in
1967      img(gi)=ker(gi-1),i.e (gi-1)oyi=0. we have
1968      (gi-1)oyi=(gi-1)o(pi)o(fi)=(pi-1)o(fi-1)ofi=0
1969  */
1970  }
1971  return(P);
1972}
1973example
1974{"EXAMPLE:"; echo = 2;
1975
1976ring r;
1977module P=grobj(module([xy,0,xz]),intvec(0,1,0));
1978grview(P);
1979
1980module D=grobj(module([y,0,z],[x2+y2,z,0]),intvec(0,1,0));
1981grview(D);
1982
1983module PP = grpres(P);
1984grview(PP);
1985
1986module DD = grpres(D);
1987grview(DD);
1988
1989
1990def T=grlifting2(DD,PP); T;
1991
1992// def Z=grlifting2(P,D); Z; // WRONG!!! 
1993             
1994}
1995
1996
1997/*
1998proc mappingcone2(A,B)
1999"USAGE: (A,B), graded objects A and B (matrices defining maps)
2000RETURN: chain complex (as a list)
2001PURPOSE: construct the free resolution of a cokernel of a random map between
2002M=coker(A), and N=coker(B)
2003NOTE:
2004             -f1 0       -f2 0
2005  (p1 g1)     p2 g2       p3 g3
2006G0<-----F0+G1<------F1+G2<-------F2+G3<-----
2007
2008EXAMPLE: example mappingcone2;
2009"
2010
2011{
2012  ASSUME(1, grtest(A));
2013  ASSUME(1, grtest(B));
2014
2015  list P=grlifting2(A,B);
2016  list rM=grres(A,1);
2017  list rN=grres(B,1);
2018
2019  int i;
2020  list T;
2021
2022  T[1]=grconcat(P[1],rN[1]);
2023
2024  for(i=2;i<=size(P);i++)
2025  {
2026    intvec v=grrange(rM[i-1]);
2027    intvec w=grdeg(rN[i]);
2028    int r=size(v);
2029    int s=size(w);
2030    module zero = (0:s);
2031
2032    module A=grconcat(P[i],rN[i]);
2033    module B=grobj(zero,v,w);
2034    module C=grconcat(-rM[i-1],B);
2035    module D=grconcat(grtranspose(C), grtranspose(A));
2036
2037    T[i]=grtranspose(D);
2038  }
2039  return(T);
2040}
2041example
2042{ "EXAMPLE:"; echo = 2;
2043
2044ring r=32003,(x(0..4)),dp;
2045def I=maxideal(1);
2046module R=grobj(module(I), intvec(0));
2047resolution FR=mres(R,0);
2048print(betti(FR,0),"betti");
2049module K=grobj(module(FR[1]),intvec(-1),intvec(0:5));
2050grview(K);
2051
2052module S=grsyz(K);
2053grview(S);
2054S;
2055
2056module SS = grpres(S);
2057
2058module B=grobj(module([1,0,0],[0,1,0],[0,0,1]),intvec(1,1,1),intvec(1,1,1));
2059// module B=grobj(module([1],[0,1],[0,0,1],[0,0,0,1], [0,0,0,0,1]),intvec(0:5));
2060grview(B);
2061B;
2062module BB = grpres(B);
2063
2064def Z=grlifting2(SS,BB);Z;
2065def G=mappingcone2(SS,BB);G;
2066}
2067*/
2068
2069
2070
2071
2072/*
2073             -f1 0        -f2 0
2074  (p1 g1)     p2 g2        p3 g3
2075G0<-----F0+G1<------F1+G2<-------F2+G3<-----
2076
2077*/
2078
2079proc mappingcone2(A,B)
2080"USAGE: (A,B), graded objects A and B (matrices defining maps)
2081RETURN: chain complex (as a list)
2082PURPOSE: construct the free resolution of cokernel of a random map between
2083M=coker(A), and N=coker(B)
2084EXAMPLE: example ????????
2085"
2086
2087{
2088  ASSUME(1, grtest(A));
2089  ASSUME(1, grtest(B));
2090
2091  list P=grlifting3(A,B);
2092  list rM=grres(A,0,1);
2093  list rN=grres(B,0,1);
2094
2095  int i;
2096  list T;
2097
2098  T[1]=grconcat(P[1],rN[1]);
2099
2100  for(i=2;i<=size(P);i++)
2101  {
2102    intvec v=grrange(rM[i-1]);
2103    intvec w=grdeg(rN[i]);
2104    int r=size(v);
2105    int s=size(w);
2106    matrix zero[r][s];
2107
2108    module A=grconcat(P[i],rN[i]);
2109    module B=grobj(zero,v,w);
2110    module C=grconcat(-rM[i-1],B);
2111    module D=grconcat(grtranspose(C), grtranspose(A));
2112
2113    T[i]=grtranspose(D);
2114  }
2115   return(T);
2116}
2117
2118
2119
2120
2121proc grlifting3(A,B)
2122{
2123  ASSUME(1, grtest(A));
2124  ASSUME(1, grtest(B));
2125
2126
2127  list rM = grres(A,0,1);
2128
2129  print( betti(rM), "betti");
2130  list rN = grres(B,0,1);
2131  print( betti(rN), "betti");
2132 
2133  int i,j,k;
2134
2135  for(i=1;i<=size(rM);i++)
2136  {
2137    if(size(rM[i])==0){break;}
2138  }
2139
2140  for(j=1;j<=size(rN);j++)
2141  {
2142    if(size(rN[j])==0){break;}
2143  }
2144  int t=min(i,j);
2145 
2146  list P;
2147
2148  "t: ", t;
2149//  grview(rM[t]);  grview(rN[t]);
2150 
2151  P[t]= grrndmap2(rM[t],rN[t]);
2152  grview(P[t]);
2153
2154  if(t==1){return(P)};
2155
2156  for(k=t-1; k>=1; k--)
2157  {
2158     "k: ", k;
2159//  grview(rM[k]);  grview(rN[k]);
2160
2161// def C = grtranspose(rM[k]); def T= grprod(rN[k],P[k+1]);
2162// def tT = grtranspose(T);
2163
2164    P[k]= grlift0( rM[k], rN[k], P[k+1] ); // grtranspose(grlift(C,tT));
2165
2166     grview(P[k]);
2167
2168   }
2169   return(P);
2170     
2171
2172}
2173example
2174{"EXAMPLE:"; echo = 2;
2175
2176ring r=32003, x(0..4),dp;
2177
2178def A=grtwist(3,1);
2179grview(A);
2180
2181def T=KeneshlouMatrixPresentation(intvec(0,1,0,0,0));
2182grview(T);
2183
2184def F=grlifting3(T,A);
2185grview(F);
2186
2187def R=KeneshlouMatrixPresentation(intvec(0,0,0,2,0));
2188def S=KeneshlouMatrixPresentation(intvec(1,2,0,0,0));
2189
2190def H=grlifting3(R, S);
2191// grview(H);
2192def H=grlifting3(S, R);
2193
2194/*
2195// ???
2196def I=KeneshlouMatrixPresentation(intvec(2,3,0,6,2));
2197def J=KeneshlouMatrixPresentation(intvec(4,0,1,2,1));
2198def N=grlifting3(I,J); grview(N); // ???
2199*/
2200}
2201
2202/*
2203             -f1 0        -f2 0
2204  (p1 g1)     p2 g2        p3 g3
2205G0<-----F0+G1<------F1+G2<-------F2+G3<-----
2206*/
2207
2208proc grneg(M)
2209"negative map
2210TODO for Hanieh: please document this and find good motivating examples for this proc!!
2211"
2212{
2213  return ( grobj(-M, grrange(M), grdeg(M) ) );
2214}
2215
2216// note: not clear which grlifting3 should be used by the following
2217// procedure!!?
2218proc mappingcone3(A,B)
2219"USAGE: (A,B), graded objects A and B (matrices defining maps)
2220RETURN: chain complex (as a list)
2221PURPOSE: construct a free resolution of the cokernel of a random map between
2222M=coker(A), and N=coker(B)
2223EXAMPLE: example mappingcone3; shows an example
2224
2225{
2226  ASSUME(1, grtest(A));
2227  ASSUME(1, grtest(B));
2228
2229  list P=grlifting4(A,B);
2230  list rM=grres(A,0,1);
2231  list rN=grres(B,0,1);
2232
2233  int i;
2234  list T;
2235
2236  T[1]=grconcat(P[1],rN[1]);
2237
2238  for(i=2;i<=size(P);i++)
2239  {
2240    intvec v= grrange(rM[i-1]);
2241    intvec w=grdeg(rN[i]);
2242    int r=size(v);
2243    int s=size(w);
2244    matrix zero[r][s];
2245
2246//    ASSUME( 0, grtest(P[i]) );
2247//    ASSUME( 0, grtest(rN[i]) );
2248
2249    module A=grconcat(P[i],rN[i]);
2250    module B=grobj(zero,v,w);
2251
2252//    ASSUME( 0, grtest(B) );
2253//    ASSUME( 0, grtest(-rM[i-1]) );   
2254    ASSUME( 0, grtest( grneg( rM[i-1]) ) );
2255    module C=grconcat( grneg( rM[i-1] ) ,B); // FIXME: '-' is wrong! need a graded-enabled minus (e.g. grneg?)
2256    module D=grconcat(grtranspose(C), grtranspose(A));
2257
2258    T[i]=grtranspose(D);
2259   
2260    kill A, B, C, D, v, w, r, s, zero;
2261  }
2262   return(T);
2263}
2264example
2265{ "EXAMPLE:"; echo = 2;
2266
2267ring r=32003,x(0..4),dp;
2268
2269def A=KeneshlouMatrixPresentation(intvec(0,0,0,0,3));
2270grview(A);
2271
2272def T= KeneshlouMatrixPresentation(intvec(0,1,0,0,0));
2273grview(T);
2274
2275def F=grlifting4(A,T); grview(F);
2276
2277/* BUG in the proc */
2278def G=mappingcone3(A,T); grview(G);
2279
2280/*
2281module W=grtranspose(G[1]);
2282resolution U=mres(W,0);
2283print(betti(U,0),"betti"); // ?
2284ideal P=groebner(flatten(U[2]));
2285resolution L=mres(P,0);
2286print(betti(L),"betti");   
2287*/
2288
2289
2290def R=KeneshlouMatrixPresentation(intvec(0,0,0,2,0));
2291grview(R);
2292
2293def S=KeneshlouMatrixPresentation(intvec(1,2,0,0,0));
2294grview(S);
2295
2296def H=grlifting4(R,S); grview(H);
2297
2298/* BUG in the proc */
2299def G=mappingcone3(R,S); // ????????
2300
2301
2302def I=KeneshlouMatrixPresentation(intvec(2,3,0,6,2));
2303def J=KeneshlouMatrixPresentation(intvec(4,0,1,2,1));
2304// def N=grlifting4(I,J);
2305/* 2nd module does not lie in the first: */ // def NN=mappingcone3(I,J); // ????????
2306
2307}
2308
2309
2310// this is grlifting3 from #hani# (NOTE that this version is different
2311// to the grlifting3 that came within this library!!!
2312proc grlifting4(A,B)
2313"USAGE: (A,B), graded objects A and B (matrices defining maps)
2314RETURN: map of chain complexes (as a list)
2315PURPOSE: construct a map of chain complexes between free resolution of
2316             M=coker(A) and N=coker(B).
2317EXAMPLE: example grlifting4; shows an example
2318"
2319{
2320           ASSUME(1, grtest(A));
2321           ASSUME(1, grtest(B));
2322
2323
2324           list rM=grres(A,0,1);
2325           list rN=grres(B,0,1);
2326           int i,j,k;
2327
2328           for(i=1;i<=size(rM);i++)
2329           {
2330             if(size(rM[i])==0){break;}
2331           }
2332
2333           for(j=1;j<=size(rN);j++)
2334           {
2335             if(size(rN[j])==0){break;}
2336           }
2337           int t=min(i,j);
2338
2339           list P;
2340
2341           P[t]= grrndmap2( rM[t],rN[t] );
2342
2343           if(t==1){return(P)};
2344
2345           for(k=t-1; k>=1; k--)
2346           {
2347             def C = grtranspose(rM[k]);
2348             def T= grprod(rN[k],P[k+1]);
2349             def tT = grtranspose(T);
2350
2351             P[k]= grtranspose(grlift(C,tT));
2352
2353           }
2354           return(P);
2355}
2356example
2357{"EXAMPLE:"; echo = 2;
2358
2359ring r=32003,x(0..4),dp;
2360
2361def A=KeneshlouMatrixPresentation(intvec(0,0,0,0,3));
2362grview(A);
2363
2364def T= KeneshlouMatrixPresentation(intvec(0,1,0,0,0));
2365grview(T);
2366
2367def F=grlifting4(A,T);
2368grview(F);
2369
2370def G=mappingcone3(A,T);grview(G);
2371/*
2372module W=grtranspose(G[1]);
2373resolution U=mres(W,0);
2374print(betti(U,0),"betti"); // ?
2375ideal P=groebner(flatten(U[2]));
2376resolution L=mres(P,0);
2377print(betti(L),"betti");
2378*/
2379
2380
2381def R=KeneshlouMatrixPresentation(intvec(0,0,0,2,0));
2382def S=KeneshlouMatrixPresentation(intvec(1,2,0,0,0));
2383
2384def H=grlifting4(R,S); grview(H);
2385
2386def G=mappingcone3(R,S); // ????????
2387
2388def I=KeneshlouMatrixPresentation(intvec(2,3,0,6,2));
2389def J=KeneshlouMatrixPresentation(intvec(4,0,1,2,1));
2390/* 2nd module does not lie in the first: */ //def N=grlifting4(I,J);
2391
2392}
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