91直播

报告人: 何旭华（马里兰大学） 

时  间: 2018年6月27日  14:00—15:00

地  点: 理科楼LD304

摘  要:An invertible nxn matrix is totally positive (resp. totally nonnegative) if all the minors are positive (resp. nonnegative). This definition is introduced by Schoenberg in the 30's. The systematic study of the total positivity is due to Lusztig in the 90's. In this talk, we will give an overview of the total positivity for GL_n (the group of invertible nxn matrices) and its Grassmannian, and its flag varieties. If time allows, we will talk about a recent conjecture of Arkani-Hamed, Witten, et. al. on the total positivity of the Grassmannian of GL_n.   

报告人简介:何旭华，马里兰大学教授。2018年国际数学家大会45分钟报告；96年奥数金牌。个人网页见://www.math.umd.edu/~xuhuahe/。

91直播 联系人: 李寒峰

欢迎广大师生积极参与！