isVeryAmple -- checks if the Polyhedron is very ample

Synopsis

• Usage:
b = isVeryAmple P
• Inputs:
• P, , , which must be compact
• Outputs:

Description

A lattice polytope P in the QQ space of a lattice $M$ is very ample if for every vertex $v\in P$ the semigroup $\mathbb{N}(P\cap M - v)$ generated by $P\cap M - v = \{v'-v|v'\in P\cap M\}$ is saturated in $M$. For example, normal lattice polytopes are very ample.

Note that therefore P must be compact and a lattice polytope.

 i1 : P = convexHull matrix {{0,1,0,0,1,0,1,2,0,0},{0,0,1,0,1,0,2,2,0,-1},{0,0,0,1,2,0,1,2,0,-1},{0,0,0,0,-1,1,0,-1,0,1},{0,0,0,0,0,0,-1,-1,1,1}} o1 = P o1 : Polyhedron i2 : isVeryAmple P o2 = true

Ways to use isVeryAmple :

• "isVeryAmple(Polyhedron)"

For the programmer

The object isVeryAmple is .