Bijections from Weighted Dyck Paths to Schröder Paths
Dan Drake
Department of Mathematical Sciences
Korea Advanced Institute of Science and Technology
Daejeon 305-701
Korea
Abstract:
Kim and Drake used generating functions to prove that the number of
2-distant noncrossing matchings, which are in bijection with little
Schröder 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 Schröder paths, and from a similar set of Dyck
paths to big Schröder 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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(Concerned with sequences
A000108
A001003
A001263
A001850
A004148
A006318
A060693
A116363
A126216.)
Received June 15 2010;
revised version received September 17 2010.
Published in Journal of Integer Sequences, December 5 2010.
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