Descent polynomials

13 Nov 2017 Diaz-Lopez Alexander Harris Pamela E. Insko Erik Omar Mohamed Sagan Bruce E.

Let $n$ be a nonnegative integer and $I$ be a finite set of positive integers. In 1915, MacMahon proved that the number of permutations in the symmetric group $\mathfrak{S}_n$ with descent set $I$ is a polynomial in $n$... (read more)

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