Quasi-socle ideals in Gorenstein numerical semigroup rings

Abstract

Quasi-socle ideals, that is the ideals $I$ of the form $I=Q:{\mathfrak{m}}^q$ in Gorenstein numerical semigroup rings over fields are explored, where $Q$ is a parameter ideal, and $\mathfrak{m}$ is the maximal ideal in the base local ring, and $q\ge 1$ is an integer. The problems of when $I$ is integral over $Q$ and of when the associated graded ring $\mathrm{G}(I)={⨁}_{n\ge 0}{I}^n/I^{n+1}$ of $I$ is Cohen-Macaulay are studied. The problems are rather wild; examples are given.

20 pages, to appear in Journal of Algebra

Cited by in corpus (1)

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