Cluster-additive functions on stable translation quivers

Details Cluster-additive functions on stable translation quivers Cluster-additive functions on stable translation quivers

2011-05-08

arxiv.org/abs/1105.1529v1

Mathematics

Representation Theory

24 pages

Scientific paper

Additive functions on translation quivers have played an important role in the representation theory of finite dimensional algebras, the most prominent ones are the hammock functions introduced by S. Brenner. When dealing with cluster categories (and cluster-tilted algebras), one should look at a corresponding class of functions defined on stable translation quivers, namely the cluster-additive ones. We conjecture that the cluster-additive functions on a stable translation quiver of Dynkin type A_n, D_n, E_6, E_7, E_8 are non-negative linear combinations of cluster-hammock functions (with index set a tilting set). The present paper provides a first study of cluster-additive functions and gives a proof of the conjecture in the case A_n.

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