qsms.math.snu.ac.kr - [QSMS Seminar 2023-12-13] A user’s guide to Schubert calculus of Lagrangian Grassmannians

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일정시작	2023-12-13
배경색상	#77CC00

일정시작

2023-12-13

배경색상

#77CC00

Date: 2023-12-13 (Wed) 10:00 AM ~ 12:00 PM
Place: 129-406 (SNU)
Speaker: 김현문 (University of Toronto)
Title: A user’s guide to Schubert calculus of Lagrangian Grassmannians
Abstract: Understanding the topology of real and complex Lagrangian Grassmannians is a classical question. In varying degrees, the topology of real Lagrangian Grassmannians was investigated by Borel (1951), Arnold (1967), Fuks (1968), Fuchs (2004), and Rabelo (2016), and for complex Lagrangian Grassmannians, by Borel (1951), Bernstein-Gelfand-Gelfand (1973), and Pragacz (1991). One of the tools to understand them has been the Schubert / Arnold / Bruhat cell decomposition. However, the natural inclusion of the real Lagrangian Grassmannian inside the complex Lagrangian Grassmannian, does not induce maps of chain complexes. We will show how to subdivide the complex Schubert cells so that the inclusion map induces a chain map. We will also give an updated user’s guide to understanding the topology the real Lagrangian Grassmannians using shifted Young diagrams of Pragacz.

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2021.09.09

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[SNU Number Theory Seminar 31 Mar] Height gap theorem and almost law