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math.CO2019
Two examples of Wilf-collapse
Michael Albert, Vít Jelínek, Michal Opler
Two permutation classes, the X-class and subpermutations of the increasing oscillation are shown to exhibit an exponential Wilf-collapse. This means that the number of distinct enu…
math.CO2019★ 1 cited
Wilf collapse in permutation classes
Michael Albert, Vít Jelínek, Michal Opler
For a hereditary permutation class , we say that two permutations and of are Wilf-equivalent in , if has the same numb…
math.CO2019
Uniquely-Wilf classes
Michael Albert, Jinge Li
Two permutations in a class are Wilf-equivalent if, for every size, , the number of permutations in the class of size containing each of them is the same. Those infinite cla…