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Events - January 2013

Thursday, January 31, 2013 — 3:30 PM EST

Matt Valeriote, McMaster University

"Characterizing congruence n-permutability"

Wednesday, January 30, 2013 — 3:30 PM EST

Sergey Grigorian,  Simons Center for Geometry and Physics

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

Tuesday, January 29, 2013 — 3:00 PM EST

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

"The model-companion of partial differential fields with an automorphism"

We explain how one can characterize the existentially closed models in terms of differential-algebraic varieties, and then show that this class is elementary using characteristic sets of differential prime ideals.
Friday, January 25, 2013 — 3:30 PM EST

Michael Hartz, Department of Pure Mathematics, University of Waterloo

"Universal operator algebras for commuting row contractions"

Thursday, January 24, 2013 — 4:30 PM EST

Matthew Wiersma, Department of Pure Mathematics University of Waterloo

“The Banach-Tarski Paradox”

Many of us are familiar with the statement of the Banach-Tarski Paradox. This counterintuitive theorem tells us that it is possible to break a ball into finitely many pieces and rearrange those pieces to form two identical copies of the original ball. In this talk, we will discuss this theorem’s proof and use it to motivate the study of amenable groups.

Thursday, January 24, 2013 — 3:30 PM EST

Ross Willard, Department of Pure Mathematics, University of Waterloo

"Graphs, posets, polymorphisms, and the Constraint Satisfaction Problem Dichotomy Conjecture, Part II"

This is a continuation of last week's seminar. I will have
identify each of the main Maltsev conditions relevant to CSP and some
secondary ones, characterize each main Maltsev condition by a class of
structures which it forbids to be pp-interpretable, and state the

Wednesday, January 23, 2013 — 3:30 PM EST

Calder Daenzer, Penn State University

“T-duality and Picard stacks”

Tuesday, January 22, 2013 — 3:00 PM EST

Rahim Moosa, Department of Pure Mathematics, University of Waterloo

"NIP Theories II"

We will continue to read Pierre Simon’s lecture notes.

Tuesday, January 22, 2013 — 11:00 AM EST

Pantelis Eleftheriou, Department of Pure Mathematics, University of Waterloo

Groups definable in o-minimal structures

Monday, January 21, 2013 — 4:00 PM EST

Isaac Goldbring University of Illinois, Chicago

“Model theory of tracial von Neumann algebras and the Connes Embedding Problem”

Friday, January 18, 2013 — 3:30 PM EST

Evgenios Kakariadis, Department of Pure Mathematics University of Waterloo

“Isomorphism Invariants for C*-dynamical systems”

Thursday, January 17, 2013 — 3:30 PM EST

Ross Willard, Department of Pure Mathematics, University of Waterloo

Graphs, posets, polymorphisms, and the Constraint Satisfaction Problem Dichotomy Conjecture"

Wednesday, January 16, 2013 — 3:30 PM EST

Shintaro Kuroki, OCAMI and Visiting Professor at University of Toronto

Root systems of torus graphs and extended actions of torus manifolds

Tuesday, January 15, 2013 — 3:00 PM EST

Rahim Moosa, Department of Pure Mathematics, University of Waterloo

"NIP Theories"

Tuesday, January 15, 2013 — 9:30 AM EST

Elcim Elgun, Department of Pure Mathematics

"The Eberlein Compactification of Locally Compact Groups"

Friday, January 11, 2013 — 1:30 PM EST

The Cohomology Ring of a Finite Abelian Group

Collin Roberts

Tuesday, January 8, 2013 — 1:00 PM EST

Digraph Algebras over Discrete Pre-ordered Groups

Kai-Cheong Chan

Monday, January 7, 2013 — 4:00 PM EST

Thierry Giordano, University of Ottawa

"Topological orbit equivalence: an overview!"

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