Changeset 607fc7 in git
- Timestamp:
- Feb 18, 2011, 2:15:02 PM (13 years ago)
- Branches:
- (u'spielwiese', '8e0ad00ce244dfd0756200662572aef8402f13d5')
- Children:
- c1dff83921acf6b85f3e88171ce4371c322c7a68
- Parents:
- 7abf40bdd915198def06568f9d06325c0e1cdf08
- Location:
- Singular/LIB
- Files:
-
- 2 edited
Legend:
- Unmodified
- Added
- Removed
-
Singular/LIB/gmspoly.lib
r7abf40 r607fc7 1 1 /////////////////////////////////////////////////////////////////////////////// 2 version="$Id : gmspoly.lib 12529 2010-02-08 15:57:48Z seelisch$";2 version="$Id$"; 3 3 category="Singularities"; 4 4 … … 8 8 AUTHOR: Mathias Schulze, mschulze at mathematik.uni-kl.de 9 9 10 OVERVIEW: 11 A library for computing the Gauss-Manin system of a cohomologically tame 12 polynomial f. Schulze's algorithm [Sch05], based on Sabbah's theory [Sab98], 13 is used to compute a good basis of (the Brieskorn lattice of) the Gauss-Manin system and the differential operation of f in terms of this basis. 10 OVERVIEW: 11 A library for computing the Gauss-Manin system of a cohomologically tame 12 polynomial f. Schulze's algorithm [Sch05], based on Sabbah's theory [Sab98], 13 is used to compute a good basis of (the Brieskorn lattice of) the Gauss-Manin system and the differential operation of f in terms of this basis. 14 14 In addition, there is a test for tameness in the sense of Broughton. 15 Tame polynomials can be considered as an affine algebraic analogue of local 16 analytic isolated hypersurface singularities. They have only finitely many 17 citical points, and those at infinity do not give rise to atypical values 18 in a sense depending on the precise notion of tameness considered. Well-known 19 notions of tameness like tameness, M-tameness, Malgrange-tameness, and 20 cohomological tameness, and their relations, are reviewed in [Sab98, §8].21 For ordinary tameness, see Broughton [Bro88, §3].22 Sabbah [Sab98] showed that the Gauss-Manin system, the D-module direct image 23 of the structure sheaf, of a cohomologically tame polynomial carries a 24 similar structure as in the isolated singularity case, coming from a Mixed 25 Hodge structure on the cohomology of the Milnor (typical) fibre (see 15 Tame polynomials can be considered as an affine algebraic analogue of local 16 analytic isolated hypersurface singularities. They have only finitely many 17 citical points, and those at infinity do not give rise to atypical values 18 in a sense depending on the precise notion of tameness considered. Well-known 19 notions of tameness like tameness, M-tameness, Malgrange-tameness, and 20 cohomological tameness, and their relations, are reviewed in [Sab98,8]. 21 For ordinary tameness, see Broughton [Bro88,3]. 22 Sabbah [Sab98] showed that the Gauss-Manin system, the D-module direct image 23 of the structure sheaf, of a cohomologically tame polynomial carries a 24 similar structure as in the isolated singularity case, coming from a Mixed 25 Hodge structure on the cohomology of the Milnor (typical) fibre (see 26 26 gmssing.lib). The data computed by this library encodes the differential structure of the Gauss-Manin system, and the Mixed Hodge structure of the Milnor fibre over the complex numbers. As a consequence, it yields the Hodge numbers, spectral pairs, and monodromy at infinity. 27 27 28 28 REFERENCES: 29 [Bro88] S. Broughton: Milnor numbers and the topology of polynomial 29 [Bro88] S. Broughton: Milnor numbers and the topology of polynomial 30 30 hypersurfaces. Inv. Math. 92 (1988) 217-241. 31 [Sab98] C. Sabbah: Hypergeometric periods for a tame polynomial. 31 [Sab98] C. Sabbah: Hypergeometric periods for a tame polynomial. 32 32 arXiv.org math.AG/9805077. 33 [Sch05] M. Schulze: Good bases for tame polynomials. 33 [Sch05] M. Schulze: Good bases for tame polynomials. 34 34 J. Symb. Comp. 39,1 (2005), 103-126. 35 35 … … 83 83 @format 84 84 int k= 85 1; if f is tame in the sense of Broughton [Bro88, §3]85 1; if f is tame in the sense of Broughton [Bro88,3] 86 86 0; if f is not tame 87 87 @end format … … 450 450 proc goodBasis(poly f) 451 451 "USAGE: goodBasis(f); poly f 452 ASSUME: f is cohomologically tame in the sense of Sabbah [Sab98, §8]452 ASSUME: f is cohomologically tame in the sense of Sabbah [Sab98,8] 453 453 RETURN: 454 454 @format -
Singular/LIB/gmssing.lib
r7abf40 r607fc7 1 1 /////////////////////////////////////////////////////////////////////////////// 2 version="$Id : gmssing.lib 13548 2010-10-19 07:45:40Z hannes$";2 version="$Id$"; 3 3 category="Singularities"; 4 4 … … 8 8 AUTHOR: Mathias Schulze, mschulze at mathematik.uni-kl.de 9 9 10 OVERVIEW: 11 A library for computing invariants related to the Gauss-Manin system of an 10 OVERVIEW: 11 A library for computing invariants related to the Gauss-Manin system of an 12 12 isolated hypersurface singularity. 13 13 14 14 REFERENCES: 15 [Sch01] M. Schulze: Algorithms for the Gauss-Manin connection. J. Symb. Comp. 15 [Sch01] M. Schulze: Algorithms for the Gauss-Manin connection. J. Symb. Comp. 16 16 32,5 (2001), 549-564. 17 [Sch02] M. Schulze: The differential structure of the Brieskorn lattice. 18 In: A.M. Cohen et al.: Mathematical Software - ICMS 2002. 17 [Sch02] M. Schulze: The differential structure of the Brieskorn lattice. 18 In: A.M. Cohen et al.: Mathematical Software - ICMS 2002. 19 19 World Scientific (2002). 20 [Sch03] M. Schulze: Monodromy of Hypersurface Singularities. 20 [Sch03] M. Schulze: Monodromy of Hypersurface Singularities. 21 21 Acta Appl. Math. 75 (2003), 3-13. 22 [Sch04] M. Schulze: A normal form algorithm for the Brieskorn lattice. 22 [Sch04] M. Schulze: A normal form algorithm for the Brieskorn lattice. 23 23 J. Symb. Comp. 38,4 (2004), 1207-1225. 24 24 … … 50 50 KEYWORDS: singularities; Gauss-Manin system; Brieskorn lattice; 51 51 mixed Hodge structure; V-filtration; weight filtration; 52 Bernstein-Sato polynomial; monodromy; spectrum; spectral pairs; 52 Bernstein-Sato polynomial; monodromy; spectrum; spectral pairs; 53 53 good basis 54 54 ";
Note: See TracChangeset
for help on using the changeset viewer.