Robert Brignall
Published 2006-09-28Version 1
A permutation class which is closed under pattern involvement may be described in terms of its basis. The wreath product construction X \wr Y of two permutation classes X and Y is also closed, and we investigate classes Y with the property that, for any finitely based class X, the wreath product X \wr Y is also finitely based.
Labelled well-quasi-order in juxtapositions of permutation classes
Enumerating two permutation classes by number of cycles
Two examples of Wilf-collapse
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