Flag Space, Matroidal Schur Algebras and the Steinberg Representation

We define via generators and relations an extended version of the matroidal Schur algebras introduced in earlier work of the author with Tom Braden.

In the case of projective geometries, we relate the representation theory of the resulting algebras to the structure of the modular Steinberg representation of $GL(n,q)$.

In the general case we show that the extended matroidal Schur algebras have a triangular, or Reedy, decomposition and are thus quasi-hereditary.

We also obtain a new description of the original matroidal Schur algebras and clarify the connection to the flag spaces of Brylawski--Varchenko.