Bijections from weighted Dyck paths to Schroeder paths

Details Bijections from weighted Dyck paths to Schroeder paths Bijections from weighted Dyck paths to Schroeder paths

2010-06-10

arxiv.org/abs/1006.1959v2

J. Integer Seq. 13 (2010), no. 9, Article 10.9.2, 20 pp

Mathematics

Combinatorics

16 pages, TikZ figures, includes Sage code

Scientific paper

Kim and Drake used generating functions to prove that the number of 2-distant noncrossing matchings, which are in bijection with little Schroeder paths, is the same as the weight of Dyck paths in which downsteps from even height have weight 2. This work presents bijections from those Dyck paths to little Schroeder paths, and from a similar set of Dyck paths to big Schroeder paths. We show the effect of these bijections on the corresponding matchings, find generating functions for two new classes of lattice paths, and demonstrate a relationship with 231-avoiding permutations.

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