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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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