Nonabelian $H^2$ with coefficients in a group and with coefficients in a crossed module
Group Theory
2026-03-31 v3 Algebraic Geometry
Category Theory
K-Theory and Homology
Abstract
In this note, following Dedecker and Debremaeker, we extend the cohomology exact sequence for nonabelian , using nonabelian with coefficients in crossed modules.
Keywords
Cite
@article{arxiv.1608.07366,
title = {Nonabelian $H^2$ with coefficients in a group and with coefficients in a crossed module},
author = {Mikhail Borovoi},
journal= {arXiv preprint arXiv:1608.07366},
year = {2026}
}
Comments
V.1: 9 pages, v.3: 10 pages, with appendices