5 citations · 22 across the 30 of their papers we have counts for
30 papers
Eulerian polynomials, Stirling permutations and increasing trees
Shi-Mei Ma, Jun Ma, Jean Yeh +1
We study two generalizations of the gamma-expansion of Eulerian polynomials from the viewpoint of the decompositions of statistics. We first present an expansion formula of the tri…
Excedance-type polynomials and gamma-positivity
Shi-Mei Ma, Jun Ma, Jean Yeh +1
The object of this paper is to give a systematic treatment of excedance-type polynomials. We first give a sufficient condition for a sequence of polynomials to have alternatingly i…
A symmetry on weakly increasing trees and multiset Schett polynomials
Zhicong Lin, Jun Ma
By considering the parity of the degrees and levels of nodes in increasing trees, a new combinatorial interpretation for the coefficients of the Taylor expansions of the Jacobi ell…
Eulerian pairs and Eulerian recurrence systems
Shi-Mei Ma, Jun Ma, Jean Yeh +1
In this paper, we characterize a duality relation between Eulerian recurrences and Eulerian recurrence systems, which generalizes and unifies Hermite-Biehler decompositions of seve…
Plateaux on generalized Stirling permutations and partial -positivity
Zhicong Lin, Jun Ma, Philip B. Zhang
We prove that the enumerative polynomials of generalized Stirling permutations by the statistics of plateaux, descents and ascents are partial -positive. Specialization of our r…
The gamma-positivity of Eulerian polynomials and succession statistics
Shi-Mei Ma, Jun Ma, Jean Yeh +1
This paper is concerned with multivariate refinements of the gamma-positivity of Eulerian polynomials by using the succession and fixed point statistics. Properties of the enumerat…