时间:2020年10月28日(星期三) 下午4:00-5:00
地点:Zoom ID:851 6984 9971,密码:1kezMW%j
报告题目:A generalization of the quadrangulation relation to constellations and hypermaps
主讲人:方文杰
报告摘要:Constellations and hypermaps generalize combinatorial maps,i.e. embedding of graphs in a surface, in terms of factorization of permutations. In this paper, we extend a result of Jackson and Visentin (1990) on an enumerative relation between quadrangulations and bipartite quadrangulations. We show a similar relation between hypermaps and constellations by generalizing a result in the original paper on factorization of characters. Using this enumerative relation, we recover a result on the asymptotic behavior of hypermaps of Chapuy (2009).
报告人简介:方文杰,博士毕业于巴黎七大,师从法国组合学家Mireille bouquet-Mélou和Guillaume Chapuy。 曾在法国ENS Lyon和奥地利TU Graz从事博士后研究工作, 现在为法国Université Gustave Eiffel的maitre de conférences(相当于副教授)。方博士主要研究地图的计数和双射组合,在组合数学权威杂志发表多篇论文。
会议链接:https://univ-eiffel.zoom.com.cn/j/85169849971
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数学科学学院