# Events by month

## November 2014

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### Pure Math colloquium

Monday, November 3, 2014 — 4:00 PM EST

Benjamin Steinberg, City College of New York

"Groupoid algebras and C*-algebras"

### Universal Algebra seminar

Tuesday, November 4, 2014 — 10:30 to 10:30 AM EST

Ross Willard, Department of Pure Mathematics, University of Waterloo

“Adding Gaussian elimination to local consistency checking - 4”

### Geometry working seminar

Tuesday, November 4, 2014 — 1:00 PM EST

Jonathan Herman, Pure Mathematics, University of Waterloo

"Totally Geodesic Immersions"

### Algebra learning seminar

Wednesday, November 5, 2014 — 1:30 PM EST

Ehsaan Hossain, Department of Pure Mathematics, University of Waterloo

“Goodbye K0 ... Hello K1!”

### Number Theory seminar

Thursday, November 6, 2014 — 1:30 PM EST

David McKinnon, Department of Pure Mathematics, University of Waterloo

“Integral points on punctured varieties”

### Geometry working seminar

Friday, November 7, 2014 — 1:00 PM EST

Suzanne Findleton, Pure Mathematics, University of Waterloo

"Gluing constructions and separated schemes"

In this talk, we explain how one can obtain new schemes by gluing together a collection of schemes. This is known as the "gluing construction", which can produce for example projective n-space over a given ring. We also introduce the notion of a separated scheme and explain its relation to Hausdorffness.

### Geometry & Topology seminar

Friday, November 7, 2014 — 2:30 PM EST

Xiangwen Zhang, Columbia University

“ALEXANDROV’S UNIQUENESS THEOREM FOR CONVEX SURFACES”

### Analysis seminar

Friday, November 7, 2014 — 3:30 PM EST

James A. Mingo, Queen’s University

“Freeness and the Transpose”

### Universal Algebra seminar

Tuesday, November 11, 2014 — 10:30 to 10:30 AM EST

Ross Willard, Pure Mathematics, University of Waterloo

"Adding Gaussian elimination to local consistency checking - 5"

In this fifth of several lectures, I continue the analysis of
singular pairs of variables, studying their effect on the congruence
lattice of their associated constraint relation.

### Tuesday Geometry Working seminar

Tuesday, November 11, 2014 — 1:00 PM EST

Spiro Karigiannis, Pure Mathematics, University of Waterloo

"Intro to Calibrations, Instantons, and Branes"

### Computability learning seminar

Tuesday, November 11, 2014 — 3:30 PM EST

Mohammad Mahmoud, Department of Pure Mathematics University of Waterloo

“Goncharov’s Theorem”

We continue through the proof of Goncharov’s Theorem from Mcpherson’s research paper.

### Pure Mathematics special colloquium

Tuesday, November 11, 2014 — 4:00 PM EST

Jack Huizenga, University of Illinois at Chicago

"Interpolation problems in algebraic geometry"

### K-Theory for C* Algebras and Vector Bundles seminar

Wednesday, November 12, 2014 — 11:30 to 11:30 AM EST

Philip Xiao, Pure Mathematics, University of Waterloo

"K-theory of C*-algebras and of topological spaces -- Part II"

### Algebra learning seminar

Wednesday, November 12, 2014 — 1:30 PM EST

Ty Ghaswala, Pure Mathematics, University of Waterloo

"Grothendieck, Whitehead and a reasonably short exact sequence"

For an ideal $I \triangleleft R$, we will define the relative $K$-groups $K_0(R,I)$, $K_1(R,I)$ and talk about the (not long, not short, but just right) exact sequence.  This sequence will provide us with a useful tool for computing $K$-groups.

### Pure Mathematics special colloquium

Wednesday, November 12, 2014 — 4:00 PM EST

"The arithmetic of postcritically finite maps"

### Special presentation

Thursday, November 13, 2014 — 3:30 PM EST

Peter Sarnak, Princeton University

“Randomness in geometry - the topology of random real hypersurfaces and percolation”

### Geometry working seminar

Friday, November 14, 2014 — 1:30 PM EST

Ty Ghaswala, Department of Pure Mathematics, University of Waterloo

“Schemes of the Separated Variety”

### Geometry and Topology seminar

Friday, November 14, 2014 — 2:30 PM EST

Lorenzo Foscolo, Stony Brook University

"Moduli spaces of monopoles and gravitational instantons"

### Analysis seminar

Friday, November 14, 2014 — 3:30 PM EST

Nicola Watson, University of Toronto

"Classification, Covering Dimension and Lifting Properties"

### Special presentation

Monday, November 17, 2014 — 4:00 PM EST

Matthew Kennedy, Carleton University

"Operator algebras and analytic group theory"

### Tuesday Geometry Working seminar

Tuesday, November 18, 2014 — 1:00 PM EST

Jon Herman, Pure Mathematics, University of Waterloo

“Geometric Interpretations of Curvature”

### Computability learning seminar

Tuesday, November 18, 2014 — 3:30 PM EST

Sam Eisenstat, Department of Pure Mathematics, University of Waterloo

“Computable Model Theory of Torsion-Free Abelian Groups”

### Algebra learning seminar

Wednesday, November 19, 2014 — 1:30 PM EST

Phillip Xiao, Department of Pure Mathematics, University of Waterloo

We’ve seen the definition of K1 and a six term exact sequence, but we still have no intuition for what they are and how to compute them. This talk will be devoted to filling that gap by showing you some examples.

### Special presentation

Wednesday, November 19, 2014 — 4:00 PM EST

David Savitt, University of Arizona

"Galois Representations"

### Number Theory seminar

Thursday, November 20, 2014 — 1:30 PM EST

Lassina Dembele, University of Warwick

“Supercuspidal types and the Jacquet-Langlands correspondence for GL2”

### Student colloquium

Thursday, November 20, 2014 — 4:30 PM EST

Boyu Li, Department of Pure Mathematics, University of Waterloo

“Asymptotic Distributions of Noncrossing Partitions”

### Geometry working seminar

Friday, November 21, 2014 — 1:00 PM EST

Robert Garbary, Department of Pure Mathematics, University of Waterloo

“Separated and Proper Maps”

### Analysis seminar

Friday, November 21, 2014 — 2:30 PM EST

Jingbo Xia, SUNY Buffalo

“Hankel operators in Lorentz ideals”

### Geometry & Topology seminar

Friday, November 21, 2014 — 2:30 PM EST

Savdeep Sethi, University of Chicago

“Triples, Instantons and Domain Walls”

### Special colloquium

Friday, November 21, 2014 — 4:00 PM EST

Xiaoheng Jerry Wang, Princeton University

“Rational points on hyperelliptic curves”

### Special Colloquium

Monday, November 24, 2014 — 4:00 PM EST

Paul Skoufranis, Texas A&M University

“Free Probability for Pairs of Faces”

### Geometry working seminar

Tuesday, November 25, 2014 — 1:00 PM EST

Spiro Karigiannis, Pure Mathematics Department, University of Waterloo

“Calibrations, Instantons, and Branes: Part II”

### Algebra seminar

Wednesday, November 26, 2014 — 2:30 PM EST

Alexander Berenbeim, Department of Pure Mathematics, University of Waterloo

“What Is Equivalence?: An Introduction to weak ω-groupoids”

### Geometry working seminar

Friday, November 28, 2014 — 1:00 PM EST

Alan Thompson, Department of Pure Mathematics, University of Waterloo

“Yet more separatedness, and an introduction to projective schemes”

### Geometry & Topology seminar

Friday, November 28, 2014 — 2:30 PM EST

Steven Gindi, Department of Pure Mathematics, University of Waterloo

“Holomorphic Twistor Spaces and Bihermitian Geometry”

### Analysis seminar

Friday, November 28, 2014 — 3:30 PM EST

Matthew Mazowita, Department of Pure Mathematics, University of Waterloo

“Weights and topological centres”

### November 2014

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