Stratification and $π$-cosupport: Finite groups

Abstract

We introduce the notion of $π$-cosupport as a new tool for the stable module category of a finite group scheme. In the case of a finite group, we use this to give a new proof of the classification of tensor ideal localising subcategories. In a sequel to this paper, we carry out the corresponding classification for finite group schemes.

17 pages; minor changes. This will appear in the Math. Zeitschrift