Positivity in skew-symmetric cluster algebras of finite type

Abstract

We prove that the basis of cluster monomials of a skew-symmetric cluster algebra A of finite type is the atomic basis of A. This means that an element of A is positive if and only if it has a non-negative expansion in the basis of cluster monomials. In particular cluster monomials are positive indecomposable, i.e. they cannot be written as a sum of positive elements.

arXiv comment12 pages, small changes, I added remark 5.1

References in corpus (1)

• Positivity for cluster algebras from surfaces

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