報告人:靳偉 教授
報告題目:Two-geodesic-transitive graphs of odd order
報告時間:2026年5月22日(周五)上午10:30
報告地點:云龍校區6號樓304報告廳
主辦單位:數學與統計學院、數學研究院、科學技術研究院
報告人簡介:
靳偉, 湘潭大學教授,省“杰青”,主要從事圖論及其相關問題研究。第八屆世界華人數學家大會45分鐘邀請報告人,第八屆歐洲數學家大會30分鐘邀請報告人,博士畢業于西澳大利亞大學(導師為Cheryl Praeger教授),米納斯聯邦大學博士后。曾在澳大利亞昆士蘭大學,拉籌伯大學和斯洛文尼亞Primorska大學訪問學習。發表學術論文50余篇,其中多篇論文發表在了JLMS(2篇), JCTB,JCTA,JGT,Eur. JC.等著名期刊上面,主持和完成國家自然科學基金多項。
報告摘要:
In this talk, we study $(G,2)$-geodesic-transitive graphs of odd order. We first give a reduction result on this family of graphs: let $N$ be an intransitive normal subgroup of $G$. Suppose that such a graph $\Gamma$ is neither $(G,2)$-arc-transitive nor $\K_{m[b]}$ where $mb$ is odd and $m,b\geq 3$. Then we show that $\Gamma$ is a cover of $\Gamma_N$, $G/N$ is faithful and quasiprimitive on $V(\Gamma_N)$, $\Gamma_N$ is $(G/N,s')$-geodesic-transitive of odd order and girth $3$ where s'=\min\{2, \diam(\Gamma_N)\}$. We next investigate odd order $(G,2)$-geodesic-transitive graphs where $G$ acts quasiprimitively on the vertex set and determine all the possible quasiprimitive action types and give examples for them.