Algebras of partial triangulations

Abstract

We introduce two classes of algebras coming from partial triangulations of marked surfaces. The first one, called frozen algebra of a partial triangulation, is generally of infinite rank and contains frozen Jacobian algebras of triangulations of marked surfaces. The second one, called algebra of a partial triangulation, is always of (explicit) finite rank and contains classical Jacobian algebras of triangulations of marked surfaces and Brauer graph algebras. We classify the partial triangulations, depending on the complexity of their frozen algebras (some are free of finite rank, some are lattices over a formal power series ring and most of them are not finitely generated over their centre). For algebras of partial triangulations, we prove that they are symmetric when the surface has no boundary. From a more representation theoretical point of view, we prove that these algebras of partial triangulations are of tame representation type and we define a combinatorial operation on partial triangulation, generalizing Kauer moves of Brauer graphs and flips of triangulations, which give derived equivalences of the corresponding algebras.