Séminaire Lotharingien de Combinatoire, B54Ag (2006), 11 pp.

Christine Bessenrodt

Algebra Invariants for Finite Directed Graphs with Relations

Abstract. Finite directed graphs with relations define finite-dimensional algebras given as factor algebras of the corresponding path algebras. In joint work with T. Holm, we studied invariants of an associated generalized Cartan matrix for certain types of algebras where the Cartan invariants basically count nonzero paths; the main motivation for this came from the context of derived module categories and derived invariants. For the so-called (skewed) gentle algebras we computed explicit combinatorial formulae for the invariant factors of the Cartan matrices. Based on the talk at the FPSAC'05 conference in Taormina, some of this work is surveyed here, and some further results on algebras of a different type are presented in the final section.

Received: December 15, 2005. Accepted: October 14, 2006. Final Version: October 16, 2006.

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