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math.CO2019
Enumeration of Permutation Classes and Weighted Labelled Independent Sets
Christian Bean, Émile Nadeau, Henning Ulfarsson
In this paper, we study the staircase encoding of permutations, which maps a permutation to a staircase grid with cells filled with permutations. We consider many cases, where rest…
math.CO2019
Algorithmic coincidence classification of mesh patterns
Christian Bean, Bjarki Gudmundsson, Tomas Ken Magnusson +1
We review and extend previous results on coincidence of mesh patterns. We introduce the notion of a force on a permutation pattern and apply it to the coincidence classification of…