On the quasi-hereditary property for staggered sheaves
Let G be an algebraic group over an algebraically closed field, acting on a variety X with finitely many orbits. Staggered sheaves are certain complexes of G-equivariant coherent sheaves on X that seem to possess many remarkable properties. In this paper, we construct "standard" and "costandard" objects in the category of staggered sheaves, and we prove that that category has enough projectives and injectives. © 2010 American Mathematical Society.