报告人：Prof. Rongwei Yang（State University of New York at Albany）

报告题目：Projective joint spectrum and infinite dihedral group

报告时间：12月4日（周五）下午4:30

报告地点：数学实验室 

报告摘要：For a tuple of operators A=(A_1, A_2, ..., A_n), the multi parameter pencil A(z)=z_1A_1+z_2A_2+...+z_nA_n is an important subject of study in various areas of mathematics. The projective joint spectrum P(A) is the set of z in C^n such that A(z) is not invertible. The infinite dihedral group is generated by two elements a and t such that a^2=t^2=1. In this talk we will compute the joint spectrum for the tuple (1, a, t) and display some interesting formulas. This settles a question raised by R. Grigorchuk. (This is a part of the joint work with R. Grigorchuk.)

报告人简介：Rongwei Yang, Professor of Department of Mathematics and Statistics, State University of New York at Albany.

Ph.D., State University of New York at Stony Brook.

Research Interests: Multi-variable operator theory, several complex variables, operator algebras, signal processing

备注：本次报告纳入数学系继续教育课程。

欢迎有兴趣的师生参加。