English

Higher Galois theory

Category Theory 2017-07-11 v4 Algebraic Topology

Abstract

We generalize toposic Galois theory to higher topoi. We show that locally constant sheaves in a locally (n-1)-connected n-topos are equivalent to representations of its fundamental pro-n-groupoid, and that the latter can be described in terms of Galois torsors. We also show that finite locally constant sheaves in an arbitrary infinity-topos are equivalent to finite representations of its fundamental pro-infinity-groupoid. Finally, we relate the fundamental pro-infinity-groupoid of 1-topoi to the construction of Artin and Mazur and, in the case of the \'etale topos of a scheme, to its refinement by Friedlander.

Keywords

Cite

@article{arxiv.1506.07155,
  title  = {Higher Galois theory},
  author = {Marc Hoyois},
  journal= {arXiv preprint arXiv:1506.07155},
  year   = {2017}
}

Comments

Final version, to appear in JPAA

R2 v1 2026-06-22T09:58:56.572Z