Algebraic entropy of sign-stable mutation loops
Algebraic entropy of sign-stable mutation loops
复制标题
符号稳定突变环的代数熵
DOI:
10.1007/s10711-021-00606-1
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发表时间:
2021
影响因子:
0.5
通讯作者:
Kano Shunsuke
中科院分区:
文献类型:
--
作者:
Ishibashi Tsukasa;Kano Shunsuke
In the theory of cluster algebras, a mutation loop induces discrete dynamical systems via its actions on the cluster- and-varieties. In this paper, we introduce a property of mutation loops, called thesign stability, with a focus on the asymptotic behavior of the iteration of the tropical-transformation. The sign stability can be thought of as a cluster algebraic analogue of the pseudo-Anosov property of a mapping class on a surface. A sign-stable mutation loop has a numerical invariant which we call thecluster stretch factor, in analogy with the stretch factor of a pseudo-Anosov mapping class on a marked surface. We compute the algebraic entropies of the cluster- and-transformations induced by a sign-stable mutation loop, and conclude that these two coincide with the logarithm of the cluster stretch factor. This gives a cluster algebraic analogue of the classical theorem which relates the topological entropy of a pseudo-Anosov mapping class with its stretch factor.
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