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math.CO2023
Non-overlapping descents and ascents in stack-sortable permutations
Sergey Kitaev, Philip B. Zhang
The Eulerian polynomials give the distribution of descents over permutations. It is also known that the distribution of descents over stack-sortable permutations (i.e. per…
math.CO2023
Enumerations of some pattern-avoiding Fishburn permutations
Yujie Du, Philip B. Zhang
In this paper, we prove two conjectures of Egge on the enumeration of several classes of pattern-avoiding Fishburn permutations. Our results include enumerating Fishburn permutatio…