Events - 2014

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

Peter Sarnak, Princeton University

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

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

Patrick Ingram, University of Colorado

"The arithmetic of postcritically finite maps"

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.

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

Philip Xiao, Pure Mathematics, University of Waterloo

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

We will continue and finish the proof that $K^0 (X) \cong K_0 (C(X))$
for $X$ a compact Hausdorff space. We'll see some simple examples, but
computing the $K_0$ (or $K^0$) can be difficult in general. In hope to
aid computation, we'll take a look at the functoriality of $K_0$ and

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

Jack Huizenga, University of Illinois at Chicago

"Interpolation problems in algebraic geometry"

Classical Lagrangian interpolation states that one can always prescribe
$n+1$ values of a single variable polynomial of degree $n$. This result
paves the way for many beautiful generalizations in algebraic geometry.
I will discuss a few of these generalizations and their relevance to

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.

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

Spiro Karigiannis, Pure Mathematics, University of Waterloo

"Intro to Calibrations, Instantons, and Branes"

Tuesday, November 11, 2014 — 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.

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

James A. Mingo, Queen’s University

“Freeness and the Transpose”

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

Xiangwen Zhang, Columbia University 

“ALEXANDROV’S UNIQUENESS THEOREM FOR CONVEX SURFACES”

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.

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

David McKinnon, Department of Pure Mathematics, University of Waterloo

“Integral points on punctured varieties”

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

Ehsaan Hossain, Department of Pure Mathematics, University of Waterloo

“Goodbye K0 ... Hello K1!”

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

Jonathan Herman, Pure Mathematics, University of Waterloo

"Totally Geodesic Immersions"

Given an isometric immersion, we will study further how the second  
fundamental form allows the geometry in the ambient space to be  
decomposed into geometry on the tangent and normal bundles. In  
particular, we'll discuss the Gauss-Codazzi equations. In the second  
part of the talk, we will look at totally geodesic immersions and some  

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

Ross Willard, Department of Pure Mathematics, University of Waterloo

“Adding Gaussian elimination to local consistency checking - 4”

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

Benjamin Steinberg, City College of New York

"Groupoid algebras and C*-algebras"

Groupoid C*-algebras form a unifying framework for a number of classes of C*-algebras including commutative ones, group C^*-algebras, group action cross products and Cuntz-Krieger, or graph, C*-algebras. Often purely algebraic properties of these algebras can be understood in terms of the groupoids, e.g., simplicity, Morita equivalence, the primitive ideal structure.

Friday, October 31, 2014 — 2:30 PM EDT

Alan Thompson, Department of Pure Mathematics, University of Waterloo

“Calabi-Yau threefolds fibred by lattice polarized K3 surfaces”

Friday, October 31, 2014 — 1:00 PM EDT

Ruxandra Moraru, Department of Pure Mathematics, University of Waterloo

“Varieties versus schemes, Part II”

Wednesday, October 29, 2014 — 11:30 PM EDT

Phillip Xiao, Department of Pure Mathematics, University of Waterloo

“K-theory for C*-algebras and vector bundles - Part I”

Wednesday, October 29, 2014 — 3:30 PM EDT

Denis Hirschfeldt, University of Chicago

“Computability Theoretic Reduction between Pi12Principles”

Wednesday, October 29, 2014 — 1:30 PM EDT

Mohamed El Alami, Department of Pure Mathematics, University of Waterloo

“More K0

Tuesday, October 28, 2014 — 10:30 AM EDT

Ross Willard, Department of Pure Mathematics, University of Waterloo

“Adding Gaussian elimination to local consistency checking”

Monday, October 27, 2014 — 4:00 PM EDT

Denis Hirschfeldt, University of Chicago

"Computable Mathematics and Reverse Mathematics"

Friday, October 24, 2014 — 3:30 PM EDT

Matthew Wiersma, Pure Mathematics, University of Waterloo

"Intermediate $C^*$-norms"

Friday, October 24, 2014 — 2:30 PM EDT

Francesco Sala, University of Western Ontario

“Sheaves on root stacks and Nakajima quiver varieties”

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