Morita equivalences and the inductive blockwise Alperin weight condition for type 𝖠

Abstract

As a step to establish the blockwise Alperin weight conjecture for all finite groups, we verify the inductive blockwise Alperin weight condition introduced by Navarro–Tiep and Späth for simple groups of Lie type A {\mathsf {A}} , split or twisted. Key to the proofs is to reduce the verification of the inductive condition to the isolated (that means unipotent) blocks, using the Jordan decomposition for blocks of finite reductive groups given by Bonnafé, Dat and Rouquier.