D-Koszul algebras

In this paper we study d-Koszul algebras which were introduced by Berger. We show that when dgreater-or-equal, slanted3, these are classified by the Ext-algebra being generated in degrees 0, 1, and 2. We show the Ext-algebra, after regrading, is a Koszul algebra and present the structure of the Ext-algebra.