Generators of the initial ideal of simplicial toric ideals

Abstract

We describe a generating set for the initial ideal of simplicial toric ideals with respect to the graded reverse lexicographic order, using representations of elements of affine monoids as sums of irreducible elements. Although the resulting generating set is not necessarily minimal, we demonstrate, through an example, how one can obtain the reduced Gr\"obner basis from it. Moreover, we compare the maximal degree of the Gr\"obner basis and the Castelnuvo-Mumford regularity.