*主持人：杜若霞 教授

*讲座内容简介：

Gamma-positivity implies unimodality for palindromic polynomials. The idea behind it stems from work of Foata, Schutzenberger and Strehl on the Eulerian polynomials. I will present my work on this theme from the view point of permutation statistics, from q-Eulerian polynomials to Gessel’s gamma-positivity conjecture, to our recent exciting connections found between multiset Eulerian polynomials and weakly increasing trees, as well as some of my favorite conjectures.

*主讲人简介：

林志聪，山东大学数学与交叉科学研究中心教授、齐鲁青年学者，主要从事计数组合学的研究，在《J. Combin. Theory Ser. A》、《Combinatorica》、《European J. Combin.》、《Proc. Amer. Math. Soc.》等权威期刊发表SCI学术论文40余篇。任中国数学会计算机数学专业委员会委员。近期的研究兴趣主要集中在排列统计量及其相关组合结构上的双射和同分布问题。