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20

2023-09

Steinberg’s cross-section of Newton strata

数论与表示论讨论班Number Theory and Representation Theory SeminarTime: May 31, Wednesday, 15:00-16:00 Venue: 数学高等研究院Lecture HallSpeaker: 聂思安Sian Nie (Academy of Mathematics and Systems Science)Title: Steinberg’s cross-section of Newton strataAbstract: Let G be a simply connected semisimple group of rank r over an algebraically closed field. Steinberg has associated to each minimal lengt...

20

2023-09

Harder-Narasimhan stratification in p-adic Hodge theory

数论与表示论讨论班Number Theory and Representation Theory SeminarTime: May 31, Wednesday, 16:15-17:15 Venue: 数学高等研究院Lecture HallSpeaker: 陈苗芬Miaofen Chen (East China Normal University)Title: Harder-Narasimhan stratification in p-adic Hodge theoryAbstract: we will talk about the construction of Harder-Narasimhan stratification on the B_{dR}^+-Grassmannian and study its basic geometri...

20

2023-09

Parameter space of cubic polynomials with a parabolic fixed point

Title: Parameter space of cubic polynomials with a parabolic fixed pointAbstract: We study the topological structure of the parameter space for the cubic polynomial family \lambda z+az^2+z^3 when \lambda is a root of unity. We show that for any given \lambda, the connected locus in the a-plane contains a full continuum which is almost a double covering of the filled-in Julia set for the quadratic ...

20

2023-09

Zeta Functions of Shimura Varieties: Past, Present, and the Near Future

数论与表示论讨论班Number Theory and Representation Theory SeminarTime: June 21, Wednesday, 16:00-17:00 Venue: Lecture HallSpeaker:Yihang Zhu朱艺航（University of Maryland） Title: Zeta Functions of Shimura Varieties: Past, Present, and the Near FutureAbstract: I will first recall the general expectations of Shimura, Langlands, and Kottwtiz on the shape of the zeta function of a Shimura variety, or...

20

2023-09

Number Theory and Representation Theory Seminar

数论与表示论讨论班Number Theory and Representation Theory SeminarTime: June 28, Wednesday, 15:00-16:00 Venue： Lecture HallSpeaker：Bin Xu 徐斌（Tsinghua University）Title：On the structure of Arthur packets for real symplectic and orthogonal groupsAbstract: The irreducible admissible representations of Arthur class are the local components of automorphic representations. They are conjectured to b...

20

2023-09

A local twisted trace formula for Whittaker induction of coregular symmetric pairs

数论与表示论讨论班Number Theory and Representation Theory SeminarTime: June 28, Wednesday, 16:00-17:00 Venue: Lecture HallSpeaker:Chen Wan万忱（Rutgers University） Title: A local twisted trace formula for Whittaker induction of coregular symmetric pairsAbstract: In this talk, I will discuss the geometric expansion of a local twisted trace formula for the Whittaker induction of any symmetric pairs...

20

2023-09

Algebraic Birkhoff factorization and locality in renormalization

20

2023-09

What is in Galois' testamentary letter and why should one read it?

20

2023-09

Loop group action on symplectic cohomology

20

2023-09

The order complex of cosets in a finite group

题目: The order complex of cosets in a finite group报告人: 孟沆洋（上海大学）时间：2023年9月8日上午9:00-11:00地点：紫金港校区海纳楼2幢203 摘要: In this talk, we will introduce some algebraic topology methods on studying the poset(=partial ordered set) of some cosets of a finite group. Let G be a finite group and X be a subgroup of G. We investigate the topological properties of poset C_X(G) o...

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