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Mathematics & Statistics Colloquium: Henry Schenck
Time: Feb 17, 2017 (04:00 PM)
Location: Parker Hall 249

Details:

schenck

Speaker: Professor Henry Schenck, University of Illinois (http://www.math.uiuc.edu/~schenck/)

Title: Hyperplane Arrangements: Algebra, Combinatorics, Topology

Abstract: A hyperplane arrangement is a collection
\[
\mathcal{A} = \bigcup\limits_{i=1}^d H_i \subseteq \mathbb{K}^n,
\]
where typically \(\mathbb{K}\) is \(\mathbb{R}\) or \(\mathbb{C}\). The complement \(X = \mathbb{K}^n \setminus \mathcal{A}\) has very interesting topology. In 1980 Orlik and Solomon determined the cohomology ring; \(H^*(X,\mathbb{Z})\) is a quotient of an  exterior algebra \(E\) with a generator for each hyperplane. Surprisingly, all relations are determined by the combinatorics of \(\mathcal{A}\). Nevertheless, there remain many interesting open questions, which involve a beautiful interplay of algebra, combinatorics, geometry, and topology. I'll spend much of the talk discussing this interplay, and close by discussing several conjectures in the field, along with recent progress on those conjectures, where the Bernstein-Gelfand-Gelfand correspondence plays a key role.

Faculty host: Yanzhao Cao





Last updated: 02/21/2017