Interface to Groebner Fan¶
AUTHOR:
Anders Nedergaard Jensen: Write gfan C++ program, which implements algorithms many of which were invented by Jensen, Komei Fukuda, and Rekha Thomas.
William Stein (2006-03-18): wrote gfan interface (first version)
Marshall Hampton (2008-03-17): modified to use gfan-0.3, subprocess instead of os.popen2
TODO – much functionality of gfan-0.3 is still not exposed:
* at most 52 variables:
- use gfan_substitute to make easier (?)
MH: I think this is now irrelevant since gfan can accept the original ring variables
* --symmetry is really useful
- permutations are 0-based *not* cycle notation; a <---> 0
output is broken up much more nicely.
* -- can work in Z/pZ for p <= 32749
* -- can compute individual GB's for lex and revlex (via buchberger)