Wednesday, June 26, 2019 — 4:00 PM EDT

Carlos Valero, Department of Pure Mathematics, University of Waterloo

"Why we Caré about the Poincaré Conjecture?"

Thursday, June 27, 2019 — 10:00 AM EDT

Luke MacLean, Department of Pure Mathematics, University of Waterloo

"Different extensions of first-order logic"

How does one capture the properties that aren’t definable by first-order sentences or even theories? One way is to allow infinitary conjunctions of first-order sentences. Another is to expand the language that is being used. In this talk I will discuss the cases when these two extensions coincide, and sketch a proof by W. Craig and R.L. Vaught that a computably axiomatizable theory can be finitely axiomatized using additional predicates.

Friday, June 28, 2019 — 2:30 PM EDT

Sergey Grigorian, University of Texas -- Rio Grande Valley

"Heat Flow of Isometric G2-structures"