English

On fundamental groups related to degeneratable surfaces: conjectures and examples

Algebraic Geometry 2011-06-29 v1

Abstract

We argue that for a smooth surface S, considered as a ramified cover over the projective plane branched over a nodal-cuspidal curve B one could use the structure of the fundamental group of the complement of the branch curve to understand other properties of the surface and its degeneration and vice-versa. In this paper, we look at embedded-degeneratable surfaces - a class of surfaces admitting a planar degeneration with a few combinatorial conditions imposed on its degeneration. We close a conjecture of Teicher on the virtual solvability of the mentioned fundamental group for these surfaces and present two new conjectures on the structure of this group, regarding non-embedded-degeneratable surfaces. We prove two theorems supporting our conjectures, and show that for an empbedding of a product of a projective line with a curve of genus g, the fundamental group of the complement of the branch curve is a quotient of an Artin group associated to the degeneration.

Keywords

Cite

@article{arxiv.1106.5636,
  title  = {On fundamental groups related to degeneratable surfaces: conjectures and examples},
  author = {Michael Friedman and Mina Teicher},
  journal= {arXiv preprint arXiv:1106.5636},
  year   = {2011}
}

Comments

accepted for publication at Annali della Scuola Normale Superiore

R2 v1 2026-06-21T18:28:35.483Z