Singular

D.15.9 gitfan_lib

Library:

gitfan.lib

Purpose:

Compute GIT-fans.

Authors:

Janko Boehm boehm@mathematik.uni-kl.de
Simon Keicher keicher@mail.mathematik.uni-tuebingen.de
Yue Ren ren@mathematik.uni-kl.de

Overview:

This library computes GIT-fans, torus orbits and GKZ-fans. It uses the package 'gfanlib' by Anders N. Jensen
and some algorithms have been outsourced to C++ to improve the performance. Check https://github.com/skeicher/gitfan_singular for updates.

Procedures:

D.15.9.1 afaces		Returns a list of intvecs that correspond to all a-faces
D.15.9.2 gitCone		Returns the GIT-cone around the given weight vector w
D.15.9.3 gitFan		Returns the GIT-fan of the H-action defined by Q on V(a)
D.15.9.4 gkzFan		Returns the GKZ-fan of the matrix Q
D.15.9.5 isAface		Checks whether intvec corresponds to an ideal-face
D.15.9.6 orbitCones		Returns the list of all projected a-faces