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Existence of symmetric maximal noncrossing collections of k -element sets
Journal of Algebraic Combinatorics ( IF 0.6 ) Pub Date : 2019-06-04 , DOI: 10.1007/s10801-019-00893-8
Andrea Pasquali , Erik Thörnblad , Jakob Zimmermann

We investigate the existence of maximal collections of mutually noncrossing k-element subsets of \(\left\{ 1, \ldots , n \right\} \) 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 \(n/{\text {GCD}}(k,n)\). Moreover, we present some algebraic consequences of our result related to self-injective Jacobian algebras.

中文翻译:

k元集的对称最大非交叉集合的存在

我们调查\(\ left \ {1,\ ldots,n \ right \} \)的相互不交叉的k个元素子集的最大集合的存在,这些子集在向所有索引加上\(k \ pmod n \)时是不变的。我们的主要结果是,当且仅当k等于0、1或\(-1 \)\(n / {\ text {GCD}}(k,n)\)时,这种集合才存在。此外,我们提出了与自射雅可比代数有关的结果的代数结果。
更新日期:2019-06-04
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