Mathematics – Representation Theory
Scientific paper
2008-10-20
Mathematics
Representation Theory
19 pages, 8 figures
Scientific paper
We study cluster algebras with principal coefficient systems that are associated to unpunctured surfaces. We give a direct formula for the Laurent polynomial expansion of cluster variables in these cluster algebras in terms of perfect matchings of a certain graph $G_{T,\gamma}$ that is constructed from the surface by recursive glueing of elementary pieces that we call tiles. We also give a second formula for these Laurent polynomial expansions in terms of subgraphs of the graph $G_{T,\gamma}$.
Musiker Gregg
Schiffler Ralf
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