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Browsing by Author "Úlfarsson, Henning Arnór"

Browsing by Author "Úlfarsson, Henning Arnór"

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    Enumeration of Permutation Classes and Weighted Labelled Independent Sets 
    Bean, Christian; Nadeau, Emile; Úlfarsson, Henning Arnór (DIiscrete Mathematics Theoretical Computer Science, 2021-03)
    In this paper, we study the staircase encoding of permutations, which maps a permutation to a staircase grid with cellsfilled with permutations. We consider many cases, where restricted to a permutation class, the staircase encoding be-comes a bijection ...
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    Enumerations of Permutations Simultaneously Avoiding a Vincular and a Covincular Pattern of Length 3 
    Bean, Christian; Claesson, Anders; Úlfarsson, Henning Arnór (University of Waterloo, 2017)
    Vincular and covincular patterns are generalizations of classical patterns allowing restrictions on the indices and values of the occurrences in a permutation. In this paper we study the integer sequences arising as the enumerations of permutations ...