PrerequisiteBasic algebraic topology and number theoryAbstractI will talk about the basics of cohomology of arithmetic groups focusing on Harder's new book. I will start from simplest cases of the group SL_2 over Z (which covers the chapter 2 and 3 of the book of Harder) and try to be as concrete as possible. The goal is to under these cohomology groups from the point of view of geometry and ar...
PrerequisiteUndergaduate Algebra, Probability and Functional AnalysisAbstractRepresentation theory of symmetric groups is a classical topic with reach history and many intersections with other areas of mathematics and physics. The conventional approach to the theory, which goes back to Frobenius, Schur, and Young, is bases on ad hoc constructions, starting from the Young diagrams. We plan to pr...