Cluster automorphisms and quasi-automorphisms

Cluster automorphisms and quasi-automorphisms
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簇自同构和准自同构

DOI:
10.1016/j.aam.2019.07.007
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发表时间:
2018-08
影响因子:
1.1
通讯作者:
Schiffler Ralf
Schiffler Ralf
中科院分区:
数学3区
文献类型:
--
作者:
Chang Wen;Schiffler Ralf

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研究了簇代数A的簇自同构与拟自同构之间的关系。我们证明了在一定的条件下,例如每个斜对称簇代数所满足的条件下,A的拟自同构群同构于A t r i v的簇自同构群的子群,并且如果A具有主系数或泛系数,则这两个群同构;这里A t r i v是通过将所有冻结变量设置为整数1从A获得的具有平凡系数的簇代数。我们还计算了所有有限型和反对称仿射型簇代数的拟自同构群,并证明了在哪些类型下它同构于A t r i v的簇自同构群。
We study the relation between the cluster automorphisms and the quasi-automorphisms of a cluster algebra A. We prove that under some mild condition, satisfied for example by every skew-symmetric cluster algebra, the quasi-automorphism group of A is isomorphic to a subgroup of the cluster automorphism group of A t r i v, and the two groups are isomorphic if A has principal or universal coefficients; here A t r i v is the cluster algebra with trivial coefficients obtained from A by setting all frozen variables equal to the integer 1. We also compute the quasi-automorphism group of all finite type and all skew-symmetric affine type cluster algebras, and show in which types it is isomorphic to the cluster automorphism group of A t r i v.
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