Universal central extensions in semi-abelian categories
Category Theory
2014-04-07 v1
Abstract
Basing ourselves on Janelidze and Kelly's general notion of central extension, we study universal central extensions in the context of semi-abelian categories. We consider a new fundamental condition on composition of central extensions and give examples of categories which do, or do not, satisfy this condition.
Keywords
Cite
@article{arxiv.1302.5501,
title = {Universal central extensions in semi-abelian categories},
author = {Jose Manuel Casas and Tim Van der Linden},
journal= {arXiv preprint arXiv:1302.5501},
year = {2014}
}
Comments
12 pages, compact revised and published version of the paper arXiv:0908.3762