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math.CO2008
-distant crossings and nestings of matchings and partitions
Dan Drake, Jang Soo Kim
We define and consider k-distant crossings and nestings for matchings and set partitions, which are a variation of crossings and nestings in which the distance between vertices is…
math.CO2007★ 23 cited
The combinatorics of associated Hermite polynomials
Dan Drake
We develop a combinatorial model of the associated Hermite polynomials and their moments, and prove their orthogonality with a sign-reversing involution. We find combinatorial inte…