Koszul duality for toric varieties

摘要

We show that certain categories of perverse sheaves on a. ne toric varieties X-sigma and X(sigma)v defined by dual cones are Koszul dual in the sense of Beilinson, Ginzburg and Soergel ( 1996). The functor expressing this duality is constructed explicitly by using a combinatorial model for mixed sheaves on toric varieties.