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arxiv: 1808.03556 · v2 · pith:5HN7TBXQnew · submitted 2018-08-10 · 🧮 math.CO · math.RT

Existence of symmetric maximal noncrossing collections of k-element sets

classification 🧮 math.CO math.RT
keywords collectionselementexistencemaximalnoncrossingresultaddingalgebraic
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We investigate the existence of maximal collections of mutually noncrossing $k$-element subsets of $\left\{ 1, \dots, n \right\}$ that are invariant under adding $k\pmod n$ to all indices. Our main result is that such a collection exists if and only if $k$ is congruent to $0, 1$ or $-1$ modulo $n/\operatorname{GCD}(k,n)$. Moreover, we present some algebraic consequences of our result related to self-injective Jacobian algebras.

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