On the associated graded ring of a semigroup ring

Abstract

Let (R;m) be a numerical semigroup ring. In this paper we study the properties of its associated graded ring G(m). In particular, we describe the H^0_M for G(m) (where M is the homogeneous maximal ideal of G(m)) and we characterize when G(m) is Buchsbaum. Furthermore, we find the length of H^0_M as a G(m)-module, when G(m) is Buchsbaum. In the 3-generated numerical semigroup case, we describe the H^0_M in term of the Apery set of the numerical semigroup associated to R. Finally, we improve two characterizations of the Cohen-Macaulayness and Gorensteinness of G(m) given in [2] and [3], respectively.

20 pages

Cited by in corpus (5)

• numericalsgps, a GAP package for numerical semigroups
• When the associated graded ring of a semigroup ring is Complete Intersection
• The Maximal Denumerant of a Numerical Semigroup
• On the Apery sets of monomial curves
• On the multiplicity of tangent cones of monomial curves