Factorial cluster algebras

  • Christof Geiß

  • Bernard Leclerc

  • Jan Schröer

    Mathematisches Institut Universität Bonn Endenicher Allee 60 53115 Bonn Germany
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We show that cluster algebras do not contain non-trivial units and that all cluster variables are irreducible elements. Both statements follow from Fomin and Zelevinsky's Laurent phenomenon. As an application we give a criterion for a cluster algebra to be a factorial algebra. This can be used to construct cluster algebras, which are isomorphic to polynomial rings. We also study various kinds of upper bounds for cluster algebras, and we prove that factorial cluster algebras coincide with their upper bounds.

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Christof Geiß, Bernard Leclerc, Jan Schröer, Factorial cluster algebras. Doc. Math. 18 (2013), pp. 249–274

DOI 10.4171/DM/396