English

The generic value set of a two-generator semigroup

Algebraic Geometry 2023-07-25 v2

Abstract

We give a simple recursion for the minimal generators G={gi}G=\{g_i\} of the generic value set Λgen\Lambda_{gen} of a plane curve germ CC with a two-generator semigroup Γp,m\Gamma \langle p, m \rangle. The main result provides for explicit calculation of all gig_i and shows that they are in fact minimal generators. Explicit formulas for the cardinality of the minimal generators G|G| and for the conductor c(Λgen)c(\Lambda_{gen}) of Λgen\Lambda_{gen} are given. The recursion can be used to compute the generic Tjurina number τgen\tau_{gen} in this case, a method we compare to that given by Alberich-Carrami\~nana, Almir\'on, Blanco, and Melle-Hern\'andez (arXiv:1904.02652). The main result is based on the non-explicit algorithm and ideas of Delorme.

Cite

@article{arxiv.2306.16279,
  title  = {The generic value set of a two-generator semigroup},
  author = {Justin Lake and Lee McEwan},
  journal= {arXiv preprint arXiv:2306.16279},
  year   = {2023}
}
R2 v1 2026-06-28T11:16:56.880Z