Authors: Adam Glesser, Markus Linckelmann
Title: Commuting categories for blocks and fusion systems
Abstract: We extend the notion of a commuting poset for a finite group
to p-blocks and fusion systems, and we generalize a result,
due originally to Alperin and proved independently by Aschbacher 
and Segev, to commuting graphs of blocks, with a very short proof 
based on the G-equivariant version, due to Thevenaz and Webb, 
of a result of Quillen.