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We investigate the existence and non-existence of maximal green sequences for quivers arising from weighted projective lines. Let $Q$ be the Gabreil quiver of the endomorphism algebra of a basic cluster-tilting object in the cluster category $mathcal{C}_mathbb{X}$ of a weighted projective line $mathbb{X}$. It is proved that there exists a quiver $Q$ in the mutation equivalence class $operatorname{Mut}(Q)$ such that $Q$ admits a maximal green sequence. On the other hand, there is a quiver in $operatorname{Mut}(Q)$ which does not admit a maximal green sequence if and only if $mathbb{X}$ is of wild type.
In a previous work (arXiv:0806.1503v2), we defined a family of subcomplexes of the $n$-dimensional half cube by removing the interiors of all half cube shaped faces of dimension at least $k$, and we proved that the homology of such a subcomplex is co
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We construct a (bi)cyclic sieving phenomenon on the union of dominant maximal weights for level $ell$ highest weight modules over an affine Kac-Moody algebra with exactly one highest weight being taken for each equivalence class, in a way not dependi
Ge asked the question whether $LF_{infty}$ can be embedded into $LF_2$ as a maximal subfactor. We answer it affirmatively by three different approaches, all containing the same key ingredient: the existence of maximal subgroups with infinite index. W