English

Linear source invertible bimodules and Green correspondence

Representation Theory 2020-04-22 v1

Abstract

We show that the Green correspondence induces an injective group homomorphism from the linear source Picard group L(B)\mathcal{L}(B) of a block BB of a finite group algebra to the linear source Picard group L(C)\mathcal{L}(C), where CC is the Brauer correspondent of BB. This homomorphism maps the trivial source Picard group T(B)\mathcal{T}(B) to the trivial source Picard group T(C)\mathcal{T}(C). We show further that the endopermutation source Picard group E(B)\mathcal{E}(B) is bounded in terms of the defect groups of BB and that when BB has a normal defect group E(B)=L(B)\mathcal{E}(B)=\mathcal{L}(B). Finally we prove that the rank of any invertible BB-bimodule is bounded by that of BB.

Cite

@article{arxiv.2004.10131,
  title  = {Linear source invertible bimodules and Green correspondence},
  author = {Markus Linckelmann and Michael Livesey},
  journal= {arXiv preprint arXiv:2004.10131},
  year   = {2020}
}
R2 v1 2026-06-23T15:00:16.348Z