13. Steenrod Algebra

Problem 13.1.
[Williamson] What is the representationtheoretic meaning of the Steenrod algebra action on modp cohomology? For example, on the cohomology of $Gr$?
 Does the Steenrod algebra act on the cohomology of any parity sheaf? (Note: examples of Goresky show that this fails for modp IC sheaves.)
Cite this as: AimPL: Sheaves and modular representations of reductive groups, available at http://aimpl.org/sheavemodular.