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Combinatorial frameworks for cluster algebras. (English) Zbl 1330.05167
Summary: We develop a general approach to finding combinatorial models for cluster algebras. The approach is to construct a labeled graph called a framework. When a framework is constructed with certain properties, the result is a model incorporating information about exchange matrices, principal coefficients, $$\mathfrak{g}$$-vectors, and $$\mathfrak{g}$$-vector fans. The idea behind frameworks arises from Cambrian combinatorics and sortable elements, and in this paper, we use sortable elements to construct a framework for any cluster algebra with an acyclic initial exchange matrix. This Cambrian framework yields a model of the entire exchange graph when the cluster algebra is of finite type. Outside of finite type, the Cambrian framework models only part of the exchange graph. In a forthcoming paper, we extend the Cambrian construction to produce a complete framework for a cluster algebra whose associated Cartan matrix is of affine type.

##### MSC:
 05E15 Combinatorial aspects of groups and algebras (MSC2010) 13F60 Cluster algebras
##### Keywords:
combinatorial models for cluster algebras
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