报告题目：Positroids and Vector Bundles on Curves
中文标题：正多面体与曲线上的向量丛
报告人 (Speaker)：华诤 教授（香港大学 中国）
报告时间 (Time)：2026年 6月8日（周一）9：30 am
报告地点 (Place)：校本部GJ303
邀请人(Inviter)：黄红娣
报告摘要：Positroids are matroids that admit a totally nonnegative realization. They naturally index the cells of the totally nonnegative Grassmannian, projected open Richardson strata in the complex Grassmannian, and affine Schubert cells in the central fiber of local models of Shimura varieties of type A. We provide a new perspective on positroids and these geometric constructions via vector bundles on singular curves, which naturally gives rise to a Poisson structure.