Cluster equivalence and graded derived equivalence

Understand

In this paper we introduce a new approach for organizing algebras of global dimension at most 2.

• We introduce the notion of cluster equivalence for these algebras, based on whether their generalized cluster categories are equivalent.
• We are particularly interested in the question how much information about an algebra is preserved in its generalized cluster category, or, in other words, how closely two algebras are related if they have equivalent generalized cluster categories.
• Our approach makes use of the cluster-tilting objects in the generalized cluster categories: We first observe that cluster-tilting objects in generalized cluster categories are in natural bijection with cluster-tilting subcategories of derived categories, and then prove a recognition theorem for the latter.