Cluster-tilted algebras of type $D_n$

Wenxu Ge, Hongbo Lv, Shunhua Zhang

Published 2008-12-03, updated 2010-01-08Version 3

Let $H$ be a hereditary algebra of Dynkin type $D_n$ over a field $k$ and $\mathscr{C}_H$ be the cluster category of $H$. Assume that $n\geq 5$ and that $T$ and $T'$ are tilting objects in $\mathscr{C}_H$. We prove that the cluster-tilted algebra $\Gamma=\mathrm{End}_{\mathscr{C}_H}(T)^{\rm op}$ is isomorphic to $\Gamma'=\mathrm{End}_{\mathscr{C}_H}(T')^{\rm op}$ if and only if $T=\tau^iT'$ or $T=\sigma\tau^jT'$ for some integers $i$ and $j$, where $\tau$ is the Auslander-Reiten translation and $\sigma$ is the automorphism of $\mathscr{C}_H$ defined in section 4.