Positivity and canonical bases in rank 2 cluster algebras of finite and affine types
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The main motivation for the study of cluster algebras initiated in math.RT/0104151, math.RA/0208229 and math.RT/0305434 was to design an algebraic framework for understanding total positivity and canonical bases in semisimple algebraic groups. In this paper, we introduce and explicitly construct the canonical basis for a special family of cluster algebras of rank 2.
27 pages; A brief introduction added, references updated and expanded, the final version to appear in Moscow Mathematical Journal
27 pages; A brief introduction added, references updated and expanded, the final version to appear in Moscow Mathematical Journal