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D.15.18.30 gitCone
Procedure from library gitfan.lib (see gitfan_lib).
- Usage:
- gitCone(a, Q, w); a: ideal, Q:bigintmat, w:bigintmat
- Purpose:
- Returns the GIT-cone lambda(w), i.e. the intersection of all
orbit cones containing the vector w.
- Note:
- call this only if you are interested in a single GIT-cone.
- Return:
- a cone.
Example:
| | LIB "gitfan.lib";
intmat Q[3][4] =
1,0,1,0,
0,1,0,1,
0,0,1,1;
ring R = 0,T(1..4),dp;
ideal a = 0;
bigintmat w[1][3] = 3,3,1;
cone lambda = gitCone(a, Q, w);
rays(lambda);
==> 1,0,0,
==> 0,1,0,
==> 1,1,1
bigintmat w2[1][3] = 1,1,1;
cone lambda2 = gitCone(a, Q, w2);
rays(lambda2);
==> 1,1,1
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