Bóna, Miklós - The absence of a pattern and the occurrences of another

dmtcs:496 - Discrete Mathematics & Theoretical Computer Science, January 1, 2010, Vol. 12 no. 2
The absence of a pattern and the occurrences of another

Authors: Bóna, Miklós

Following a question of J. Cooper, we study the expected number of occurrences of a given permutation pattern q in permutations that avoid another given pattern r. In some cases, we find the pattern that occurs least often, (resp. most often) in all r-avoiding permutations. We also prove a few exact enumeration formulae, some of which are surprising.


Source : oai:HAL:hal-00990453v1
Volume: Vol. 12 no. 2
Published on: January 1, 2010
Submitted on: March 26, 2015
Keywords: Permutation pattern,generating functions,[INFO.INFO-DM] Computer Science [cs]/Discrete Mathematics [cs.DM]


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