Thursday, June 6, 2019

Thursday, June 6, 2019 — 2:30 PM EDT

Title: Hedetnemi's conjecture is false

Speaker: Ben Moore Affiliation: University of Waterloo Room: MC 5479

Abstract:

On may 6th 2019, Yaroslav Shitov found a graph G x H such that the chromatic number of G x H is strictly smaller than the minimum of the chromatic number of G and the chromatic number of H. I will present the example.

Thursday, June 6, 2019 — 3:30 PM EDT

Title: Toric varieties from distributive lattices

Speaker: David Wagner Affiliation: University of Waterloo Room: MC 5417

Abstract:

Given a nite lattice L, consider the ring of complex polynomials in indeterminates indexed by L, modulo the ideal generated by (XaXb-Xa^bXa_b for all a; b 2 L).

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