Apéry sets and the ideal class monoid of a numerical semigroup

Laura Casabella, Marco D'Anna, Pedro A. García-Sánchez

The aim of this article is to study the ideal class monoid $\mathcal{C}\ell (S)$ of a numerical semigroup $S$ introduced by V. Barucci and F. Khouja. We prove new bounds on the card…