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Cluster algebras and continued fractions
Çanakçı, İlke ; Schiffler, Ralf
Compositio mathematica, 2018-03, Vol.154 (3), p.565-593
[Periódico revisado por pares]
London, UK: London Mathematical Society
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Título:
Cluster algebras and continued fractions
Autor:
Çanakçı, İlke
;
Schiffler, Ralf
Assuntos:
Algebra
;
Categories
;
Clusters
;
Combinatorial analysis
;
Geometry
;
Knot theory
;
Mathematical analysis
;
Mathematics
;
Modules
;
Mutation
;
Number theory
;
Sequences
;
String theory
;
Variables
É parte de:
Compositio mathematica, 2018-03, Vol.154 (3), p.565-593
Descrição:
We establish a combinatorial realization of continued fractions as quotients of cardinalities of sets. These sets are sets of perfect matchings of certain graphs, the snake graphs, that appear naturally in the theory of cluster algebras. To a continued fraction $[a_{1},a_{2},\ldots ,a_{n}]$ we associate a snake graph ${\mathcal{G}}[a_{1},a_{2},\ldots ,a_{n}]$ such that the continued fraction is the quotient of the number of perfect matchings of ${\mathcal{G}}[a_{1},a_{2},\ldots ,a_{n}]$ and ${\mathcal{G}}[a_{2},\ldots ,a_{n}]$ . We also show that snake graphs are in bijection with continued fractions. We then apply this connection between cluster algebras and continued fractions in two directions. First we use results from snake graph calculus to obtain new identities for the continuants of continued fractions. Then we apply the machinery of continued fractions to cluster algebras and obtain explicit direct formulas for quotients of elements of the cluster algebra as continued fractions of Laurent polynomials in the initial variables. Building on this formula, and using classical methods for infinite periodic continued fractions, we also study the asymptotic behavior of quotients of elements of the cluster algebra.
Editor:
London, UK: London Mathematical Society
Idioma:
Inglês;Francês
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