English

Finiteness of \'etale fundamental groups by reduction modulo $p$

Algebraic Geometry 2017-05-23 v1

Abstract

We introduce a spreading out technique to deduce finiteness results for \'etale fundamental groups of complex varieties by characteristic pp methods, and apply this to recover a finiteness result proven recently for local fundamental groups in characteristic 00 using birational geometry.

Keywords

Cite

@article{arxiv.1705.07303,
  title  = {Finiteness of \'etale fundamental groups by reduction modulo $p$},
  author = {Bhargav Bhatt and Ofer Gabber and Martin Olsson},
  journal= {arXiv preprint arXiv:1705.07303},
  year   = {2017}
}

Comments

15 pages, comments welcome

R2 v1 2026-06-22T19:53:28.248Z