Presented by: 
Peter McNamara
Tue 13 Sep, 3:00 pm - 4:00 pm

A geometric extension algebra is a convolution algebra in
(Borel-Moore) homology, or sheaf-theoretically an Ext algebra. There
are many interesting examples in Lie theory, such as symmetric group
algebras, Schur algebras, the algebra governing category O, KLR
algebras and Webster algebras. We will talk about how and when
geometric parity vanishing properties are equivalent to highest weight
structures in the representation theory of these algebras.