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主讲人:周胜林教授报告题目:On flag-transitive automorphism groups of 2-designs时间:2024年11月19日(周二)16:30-19:30地点:立德楼501摘要:In this talk, we discuss flag-transitive $2$-designs. Let $\mathcal D$ be a $2$-$(v,k,\lambda)$ design with $(v-1,k-1 )\leq (v-1)^\frac{1}{2}$ admitting a flag-transitive automorphism group $G$. We prove that $G$ is of affine, almost simple type, or product type with $rank(G)=3$. In particular, if $( v-1,k-1 )=3$ or $4$, then $G$ is of affine, almost simple type except the case that $Soc(G)=
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