A positively graded algebra is called Koszul (after Jean-Louis Koszul) if every graded simple object has a projective resolution where the th term is generated in grade . Equivalently, this holds if the internal and homological gradings on the Ext coincide.
The algebra is itself Koszul and is called the Koszul dual of .
Last revised on February 17, 2015 at 18:02:47. See the history of this page for a list of all contributions to it.