Groupoid G-spans and matrices over group rings
Category Theory
2026-03-24 v1
Abstract
When G is a finite abelian group, we define G-spans of groupoids and their associated matrices with entries in the group ring QG and show that composition of spans corresponds to multiplication of matrices.
Cite
@article{arxiv.2603.20787,
title = {Groupoid G-spans and matrices over group rings},
author = {Joachim Kock and Jesper M. Møller},
journal= {arXiv preprint arXiv:2603.20787},
year = {2026}
}
Comments
27pp