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Wednesday, January 30, 2013 3:30 pm - 3:30 pm EST (GMT -05:00)

Geometry & Topology seminar

Sergey Grigorian,  Simons Center for Geometry and Physics

“Short-time behaviour of a modified Laplacian coflow of G2-structures”

We first consider the Laplacian co-flow of co-closed G2-structures on compact 7-dimensional manifolds. This is the heat flow for the dual 4-form of a G2-structure. However this flow turns out to be not even weakly parabolic, unlike a similar flow for the G2-structure 3-form.
Thursday, January 31, 2013 3:30 pm - 3:30 pm EST (GMT -05:00)

Universal Algebra seminar

Matt Valeriote, McMaster University

"Characterizing congruence n-permutability"

Friday, February 1, 2013 3:30 pm - 3:30 pm EST (GMT -05:00)

Analysis seminar

Alexey Popov, Department of Pure Mathematics, University of Waterloo

“On the spatial structure of semigroups of partial isometries.”

It is a well-known fact that if a group of matrices is bounded, then it is simultaneously similar to a group of unitaries. We will start this talk by discussing a semigroup analogue of this statement (a set of operators is called a semigroup if it is closed under multiplication).
Monday, February 4, 2013 4:00 pm - 4:00 pm EST (GMT -05:00)

Pure Math colloquium

Spyros Alexakis, University of Toronto

“The black hole uniqueness problem, old and new.”

We address the uniqueness question of vacuum stationary black hole solutions of Einstein’s equations in general relativity, and discuss its relevance towards understanding the possible final states of evolving black holes. We present older and newer results (joint with A. Ionescu and S. Klainer- man) towards settling the uniqueness question.

Tuesday, February 5, 2013 3:00 pm - 3:00 pm EST (GMT -05:00)

Model Theory seminar

Omar Leon Sanchez, Department of Pure Mathematics, University of Waterloo

"NIP Theories IV"

We will see some examples of NIP theories and prove the Baldwin-Saxl theorem. Time permitting we will talk about invariant types.
Wednesday, February 6, 2013 3:30 pm - 3:30 pm EST (GMT -05:00)

Geometry & Topology seminar

Xiaowei Wang, Rutgers University Newark

“Greatest Ricci curvature lower bounds and conic K ̈ahler-Einstein metrics”

In this joint work with Jian Song, we study the existence of conical K ̈ahler-Einstein metrics on a Fano manifold X and its relation to the greatest Ricci curvature lower bound R(X) of X.

Thursday, February 7, 2013 3:30 pm - 3:30 pm EST (GMT -05:00)

Universal Algebra seminar

Matt Valeriote, McMaster University

"Characterizing congruence n-permutability"

Re-scheduled seminar from January 31, 2013.

Friday, February 8, 2013 3:30 pm - 3:30 pm EST (GMT -05:00)

Analysis seminar

Elcim Elgun, Department of Pure Mathematics, University of Waterloo

“The Eberlein Compactification of the Heisenberg Type Group Z×T×T”

Given a locally compact group G, the Eberlein compactification Ge is the spectrum of the uniform closure of the Fourier-Stieltjes algebra B(G). It is a semitopological semigroup compactification and thus a quotient of the weakly almost periodic compactification of G.

Monday, February 11, 2013 4:00 pm - 4:00 pm EST (GMT -05:00)

Pure Math colloquium

Xiaomei Zhao, Central China University and University of Waterloo

“Vinogradov-type estimates”

In this talk, we will begin with the classical Waring problem to outline the circle method, which includes a simple application of Vinogradov’s mean value theorem for minor arc esimates. We will also introduce more general Vinogradov-type estimates and their analogues in function fields.