A new class of refined Eulerian polynomials

H Sun - arXiv preprint arXiv:1802.09749, 2018 - arxiv.org
In this note we introduce a new class of refined Eulerian polynomials defined by $$ A_n (p,
q)=\sum_ {\pi\in\mathfrak {S} _n} p^{{\rm odes}(\pi)} q^{{\rm edes}(\pi)}, $$ where ${\rm …