EXTENSION ALGEBRAS OF STANDARD MODULES
LIPING LI
Abstract. Let A be a basic finite-dimensional k-algebra standardly stratified for a partial order # and # be the direct sum of all standard modules. In this paper we study the extension algebra # = Ext#A(#,#) of standard modules, characterize the stratification property of # for # and #op, and obtain a suffi- cient condition for # to be a generalized Koszul algebra (in a sense which we define).