English

On isomorphisms of generalized multifold extensions of algebras without nonzero oriented cycles

Rings and Algebras 2018-03-09 v1

Abstract

Assume that a basic algebra AA over an algebraically closed field k\Bbbk with a basic set A0A_0 of primitive idempotents has the property that eAe=keAe=\Bbbk for all eA0e \in A_0. Let nn be a nonzero integer, and ϕ\phi and ψ\psi two automorphisms of the repetitive category A^\hat{A} of AA with jump nn (namely, they send A[0]A^{[0]} to A[n]A^{[n]}, where A[i]A^{[i]} is the ii-th copy of AA in A^\hat{A} for all iZi \in \mathbb{Z}). If ϕ\phi and ψ\psi coincide on the objects and if there exists a map ρ ⁣:A0k\rho \colon A_0 \to \Bbbk such that ρ0(y)ϕ0(a)=ψ0(a)ρ0(x)\rho_0(y)\phi_0(a)=\psi_0(a)\rho _0(x) for all morphisms aA(x,y)a\in A(x,y), then the orbit categories A^/ϕ\hat{A}/\langle \phi \rangle and A^/ψ\hat{A}/\langle \psi \rangle are isomorphic as Z\mathbb{Z}-graded categories.

Keywords

Cite

@article{arxiv.1803.02969,
  title  = {On isomorphisms of generalized multifold extensions of algebras without nonzero oriented cycles},
  author = {H. Asashiba and M. Kimura and K. Nakashima and M. Yoshiwaki},
  journal= {arXiv preprint arXiv:1803.02969},
  year   = {2018}
}

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21 pages