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math.CO2023
On a conjecture on pattern-avoiding machines
Christopher Bao, Giulio Cerbai, Yunseo Choi +2
Let be West's stack-sorting map, and let be the generalized stack-sorting map, where instead of being required to increase, the stack avoids subpermutations that are or…
math.CO2022★ 1 cited
The Image of the Pop Operator on Various Lattices
Yunseo Choi, Nathan Sun
Extending the classical pop-stack sorting map on the lattice given by the right weak order on , Defant defined, for any lattice , a map that sen…
math.CO2022
Counting crucial permutations with respect to monotone patterns
Yunseo Choi
Recently, Avgustinovich, Kitaev, and Taranenko defined five types of crucial permutations, which are maximal permutations that do not contain an increasing subsequence…