Abhyankar-Moh Semigroups for arbitrary hypersurfaces

TL;DR

This paper introduces a new family of semigroups associated with arbitrary hypersurface singularities over algebraically closed fields, extending classical value semigroups of plane curves and unifying various existing extensions.

Contribution

It constructs a general framework for semigroups linked to hypersurface singularities, encompassing previous specific cases and establishing conditions for their independence from root choices.

Findings

Constructed a family of semigroups for hypersurface singularities.

Extended classical value semigroups of plane curves.

Unified existing semigroup extensions within a broader framework.

Abstract

For an arbitrary hypersurface singularity, we construct a family of semigroups associated with algebraically closed fields that arise as an infinite union of rings of series. These semigroups extend the value semigroup of a plane curve studied by Abhyankar and Moh. The algebraically closed fields under consideration possess a natural valuation that induces a corresponding value semigroup. We establish the necessary conditions under which these semigroups are independent of the choice of the root. Moreover, the extensions proposed by P. Gonz\'alez and Kiyek-Micus, where Gonz\'alez specifically addresses the case of quasi-ordinary singularities, and the extension introduced by Abbas-Assi, can be understood as particular instances within our constructed family.