Abstract
is called an integral polyhedral cone generated by {z,..., z}. It is called pointed if the origin is a vertex of C and it is called unimodular if the set of generators {z,..., z} of C forms part of a basis of the lattice ZTM. By Gordan's lemma [G1873] the semigroup C fl Z n is finitely generated for any integral polyhedral cone , i.e., there exist finitely… (More)