Resolutions for Equivariant Sheaves over Toric Varieties

Abstract

In this work we construct global resolutions for general coherent equivariant sheaves over toric varieties. For this, we use the framework of sheaves over posets. We develop a notion of gluing of posets and of sheaves over posets, which we apply to construct global resolutions for equivariant sheaves. Our constructions give a natural correspondence between resolutions for reflexive equivariant sheaves and free resolutions of vector space arrangements.

preliminary version only; 48 pages, requires packages ams*, graphicx, enumerate, xy, epsfig