报告题目：David-Barton type identities and Stirling permutations
报告人：叶永南 教授（温州大学）
报告时间：2022年7月22日（周五）下午15：00-16：30
报告地点：21幢411
摘要：In this talk, we discuss some recent results on David-Barton type identities and Stirling permutations. We first consider an alternate formulation of the David-Barton identity, which relates the alternating run polynomials to Eulerian polynomials. By using this alternate formulation, we see that for any gamma-positive polynomial, there exists a David-Barton type identity. We then discuss some enumerative polynomials of Stirling permutations, including flag ascent-plateau polynomials and left ascent-plateau polynomials. It should be noted that the flag ascent-plateau polynomial is also the alternating run polynomial of dual Stirling permutations. We show that flag ascent-plateau polynomials is semi-gamma-positive but not gamma-positive.
邀请人：朱绪鼎