Qiongqiong Pan

activity

20192025

collaborators

3 papers

math.CO2025

Counting permutations by alternating runs via Hetyei-Reiner trees

Qiongqiong Pan, Yunze Wang, Jiang Zeng

The generating polynomial of permutations of size $n$ , counted by the number of alternating runs, has a root at $- 1$ of multiplicity $⌊(n - 2) /2 ⌋$ for all $n \geq 2$ . Th…

math.CO2021

Cycles of even-odd drop permutations and continued fractions of Genocchi numbers

Qiongqiong Pan, Jiang Zeng

Recently, Lazar and Wachs (arXiv:1910.07651) showed that the (median) Genocchi numbers play a fundamental role in the study of the homogenized Linial arrangement and obtained two n…

math.CO2019

Brändén's $(p, q)$ -Eulerian polynomials, André permutations and continued fractions

Qiong Qiong Pan, Jiang Zeng

In 2008 Brändén proved a $(p, q)$ -analogue of the $γ$ -expansion formula for Eulerian polynomials and conjectured the divisibility of the $γ$ -coefficient $γ_{n, k} (p, q)$ by $(p + q)^{k}$ .…

Counting permutations by alternating runs via Hetyei-Reiner trees

Cycles of even-odd drop permutations and continued fractions of Genocchi numbers

Brändén's (p,q)-Eulerian polynomials, André permutations and continued fractions

Brändén's $(p, q)$ -Eulerian polynomials, André permutations and continued fractions