Ideally exact categories
Category Theory
2023-08-21 v2
Abstract
The purpose of this paper is to initiate a development of a new non-pointed counterpart of semi-abelian categorical algebra. We are making, however, only the first step in it by giving equivalent definitions of what we call ideally exact categories, and showing that these categories admit a description of quotient objects by means of intrinsically defined ideals, in spite of being non-pointed. As a tool we involve a new notion of essentially nullary monad, and show that Bourn protomodularity condition makes cartesian monads essentially nullary. All semi-abelian categories, all non-trivial Bourn protomodular varieties of universal algebras, and all cotoposes are ideally exact.
Keywords
Cite
@article{arxiv.2308.06574,
title = {Ideally exact categories},
author = {George Janelidze},
journal= {arXiv preprint arXiv:2308.06574},
year = {2023}
}