Degenerations for derived categories
Bernt Tore Jensen, Xiuping Su, and Alexander Zimmermann

Abstract. We propose a theory of degenerations for derived
module categories, analogous to degenerations in module varieties for module
categories. In particular we define two types of degenerations, one algebraic
and the other geometric. We show that these are equivalent, analogously to
the Riedtmann-Zwara theorem for module varieties. Applications to tilting
complexes are given, in particular that any two term tilting complex is
determined by its graded module structure.