The Intrinsic Fundamental Group of a Linear Category
Rings and Algebras
2018-06-12 v4 Category Theory
K-Theory and Homology
Representation Theory
Abstract
We provide an intrinsic definition of the fundamental group of a linear category over a ring as the automorphism group of the fibre functor on Galois coverings. If the universal covering exists, we prove that this group is isomorphic to the Galois group of the universal covering. The grading deduced from a Galois covering enables us to describe the canonical monomorphism from its automorphism group to the first Hochschild-Mitchell cohomology vector space.
Cite
@article{arxiv.0706.2491,
title = {The Intrinsic Fundamental Group of a Linear Category},
author = {Claude Cibils and Maria Julia Redondo and Andrea Solotar},
journal= {arXiv preprint arXiv:0706.2491},
year = {2018}
}