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C++ program help
Post 302256652 by wempy on Monday 10th of November 2008 10:06:39 AM
11-10-2008
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LEARN ABOUT DEBIAN
gfan
GFAN(1) User Commands GFAN(1) NAME
Gfan - program for computing with Groebner fans DESCRIPTION
This is a program for computing all reduced Groebner bases of a polynomial ideal. It takes a generating set for the ideal as input. By default the enumeration is done by an almost memoryless reverse search. If the ideal is symmetric the symmetry option is useful and enumer- ation will be done up to symmetry using a breadth first search. The program needs a starting Groebner basis to do its computations. If the -g option is not specified it will compute one using Buchberger's algorithm. Usage: /usr/bin/gfan [options] Options: -g Tells the program that the input is already a Groebner basis (with the initial term of each polynomial being the first ones listed). Use this option if it takes too much time to compute the starting (standard degree lexicographic) Groebner basis and the input is already a Groebner basis. --symmetry Tells the program to read in generators for a group of symmetries (subgroup of $S_n$) after having read in the ideal. The program checks that the ideal stays fixed when permuting the variables with respect to elements in the group. The program uses breadth first search to compute the set of reduced Groebner bases up to symmetry with respect to the specified subgroup. -e Echo. Output the generators for the symmetry group. --subspace Only do breadth first search on cones with their interior intersecting a specified subspace. The subspace is given by a list of hyperplane normals at the end of the input. The intersection of the hyperplanes is the subspace being specified. Note that the set of Groebner cones intersecting the subspace could be disconnected and that only one connected component is computed. Works only together with --symmetry. --disableSymmetryTest When using --symmetry this option will disable the check that the group read off from the input actually is a symmetry group with respect to the input ideal. Gfan Groebner fan package Version 0.3 May 2008 GFAN(1)