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math.CO2019
Hecke insertion and maximal increasing and decreasing sequences in fillings of stack polyominoes
Ting Guo, Svetlana Poznanović
We prove that the number of 01-fillings of a given stack polyomino (a polyomino with justified rows whose lengths form a unimodal sequence) with at most one 1 per column which do n…
math.CO2019
Tree Descent Polynomials: Unimodality and Central Limit Theorem
Amy Grady, Svetlana Poznanović
For a poset whose Hasse diagram is a rooted plane forest , we consider the corresponding tree descent polynomial , which is a generating function of the number of descen…