spielwiese
Last change
on this file since b35b93 was
b35b93,
checked in by Olaf Bachmann <obachman@…>, 26 years ago
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This commit was generated by cvs2svn to compensate for changes in r1396,
which included commits to RCS files with non-trunk default branches.
git-svn-id: file:///usr/local/Singular/svn/trunk@1397 2c84dea3-7e68-4137-9b89-c4e89433aadc
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File size:
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1 | LIB "homolog.lib"; |
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2 | ring R=0,(x,y),ds; |
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3 | ideal i=x2-y3; |
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4 | qring q = std(i); // defines the quotient ring Loc_k[x,y]/(x2-y3) |
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5 | ideal m = maxideal(1); |
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6 | module T1K = Ext(1,m,m); // computes Ext^1(R/m,R/m) |
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7 | print(T1K); |
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8 | printlevel=2; // gives more explanation |
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9 | module T2K=Ext(2,m,m); // computes Ext^2(R/m,R/m) |
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10 | print(std(T2K)); |
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11 | printlevel=0; |
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12 | module E = Ext(1,syz(m),syz(m)); |
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13 | print(std(E)); |
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14 | //We see from the matrices that T2K and E are isomorphic |
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15 | //as it should be; but both are differently presented |
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16 | //------------------------------------------- |
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17 | ring R=0,(x,y,z),dp; |
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18 | ideal i = x2y,y2z,z3x; |
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19 | module E = Ext_R(2,i); |
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20 | print(E); |
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21 | // if a 3-rd argument is given (of any type) |
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22 | // a list of Ext^k(R/i,R), a SB of Ext^k(R/i,R) and a vector space basis |
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23 | // is returned: |
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24 | list LE = Ext_R(3,i,""); |
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25 | LE; |
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26 | print(LE[2]); |
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27 | print(kbase(LE[2])); |
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28 | killall(); |
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29 | $ |
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