English

Homological Lemmas in a Non-pointed Context

Category Theory 2025-07-03 v2

Abstract

We show that non-pointed versions of the classical homological lemmas hold in regular protomodular categories equipped with a suitable posetal monocoreflective subcategory. Examples of such categories are all protomodular varieties of universal algebras having more than one constant, like the ones of unitary rings, Boolean algebras, Heyting algebras and MV-algebras, their topological models, and the dual category of every elementary topos.

Keywords

Cite

@article{arxiv.2405.11038,
  title  = {Homological Lemmas in a Non-pointed Context},
  author = {Andrea Cappelletti and Andrea Montoli},
  journal= {arXiv preprint arXiv:2405.11038},
  year   = {2025}
}
R2 v1 2026-06-28T16:31:17.026Z