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arxiv: 1210.7353 · v1 · pith:GYLWKGJJnew · submitted 2012-10-27 · 🧮 math.CO

Cyclic sieving phenomenon on annular noncrossing permutations

classification 🧮 math.CO
keywords annularnumberscyclicnarayananoncrossingnumberpermutationsphenomenon
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We show an instance of the cyclic sieving phenomenon on annular noncrossing permutations with given cycle types. We define annular $q$-Kreweras numbers, annular $q$-Narayana numbers, and annular $q$-Catalan number, all of which are polynomials in $q$. We then show that these polynomials exhibit the cyclic sieving phenomenon on annular noncrossing permutations. We also show that a sum of annular $q$-Kreweras numbers becomes an annular $q$-Narayana number and a sum of $q$-Narayana numbers becomes an annular $q$-Catalan number.

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