English

Generalized Tevelev degrees of $\mathbb{P}^1$

Algebraic Geometry 2022-12-15 v2

Abstract

Let (C,p1,,pn)(C,p_1,\ldots,p_n) be a general curve. We consider the problem of enumerating covers of the projective line by CC subject to incidence conditions at the marked points. These counts have been obtained by the first named author with Pandharipande and Schmitt via intersection theory on Hurwitz spaces and by the second named author with Farkas via limit linear series. In this paper, we build on these two approaches to generalize these counts to the situation where the covers are constrained to have arbitrary ramification profiles: that is, additional ramification conditions are imposed at the marked points, and some collections of marked points are constrained to have equal image.

Keywords

Cite

@article{arxiv.2111.05880,
  title  = {Generalized Tevelev degrees of $\mathbb{P}^1$},
  author = {Alessio Cela and Carl Lian},
  journal= {arXiv preprint arXiv:2111.05880},
  year   = {2022}
}

Comments

final version, to appear in J. Pure Appl. Algebra. notation simplified, other minor changes after referee report

R2 v1 2026-06-24T07:34:12.756Z