Herzog Class of Codimension $3$ Licci Monomial Ideals

Abstract

Let $S$ be the polynomial ring in three variables with homogeneous maximal ideal $\mathfrak{m}$. Licci ideals are ideals that can be linked by a finite number of steps to a complete intersection. All licci ideals admit a rigid deformation, and two licci ideals are said to be in the same Herzog class if they have a common rigid deformation. Guerrieri-Ni-Weyman gave a parametrization for the Herzog classes of codimension $3$ licci ideals in terms of pairs of partitions associated to Schur functors. In this paper, we give an explicit formula that determines the Herzog class of a given $\mathfrak{m}$-primary licci monomial ideal.