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- W4289129209 abstract "The classical Eulerian polynomials $A_n(t)$ are known to be gamma positive. Define the positive Eulerian polynomial $mathsf{AExc^{+}}_n(t)$ as the polynomial obtained when we sum excedances over the alternating group. We show that $mathsf{AExc^{+}}_n(t)$ is gamma positive iff $n geq 5$ and $n equiv 1$ (mod 2). When $n geq 4$, and $n equiv 0$ (mod 2) we show that $mathsf{AExc^{+}}_n(t)$ can be written as a sum of two gamma positive polynomials. Similar results are shown when we consider the positive type-D and type-D Eulerian polynomials. Finally, we show gamma positivity results when we sum excedances over derangements with positive and negative sign. Our main resuls is that the polynomial obtained by summing excedance over a conjugacy class indexed by $lambda$ is gamma positive." @default.
- W4289129209 created "2022-08-01" @default.
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- W4289129209 date "2018-12-06" @default.
- W4289129209 modified "2023-09-29" @default.
- W4289129209 title "Gamma positivity of the Excedance based Eulerian polynomial in positive elements of Classical Weyl Groups" @default.
- W4289129209 doi "https://doi.org/10.48550/arxiv.1812.02742" @default.
- W4289129209 hasPublicationYear "2018" @default.
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