报告题目:Fractional coloring of planar graphs
报告简介:Let $a,b$ be two integers with $a\geq 2b$. A graph $G$ is $(a:b)$-colorable if there exists an assignment of $b$-element subsets of $\{1,\ldots,a\}$ to vertices of $G$ such that sets assigned to adjacent vertices are disjoint. The fractional chromatic number of G, denoted by $\chi_f(G)$, is the infimum of the fractions $a/b$ such that G admits an $(a:b)$-coloring. The fractional coloring was first introduced in 1973 to seek for a proof of the Four Color Problem. In this talk, we will talk about some results on fractional coloring of planar graphs.
报告人:胡小兰,女,博士,华中师范大学数学与统计学学院副研究员、硕士生导师。2015年博士毕业于南京大学。2013.09-2013.12在美国西弗吉尼亚大学进行短期学术访问,2017.03-2018.09在捷克查理大学访问。主持国家自然科学基金面上项目和青年项目各1项,湖北省自然科学基金青年项目1项。在《图论》《SIAM离散数学》等高水平杂志发表学术论文20多篇。
报告时间:2022年11月10日(星期四)下午 2:00-3:00
报告地点:腾讯会议,ID:227-556-401
主办单位:扬州大学数学科学学院
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