# Events - 2019

Monday, July 29, 2019 — 1:30 PM EDT

## Masters Thesis Presentation

Pawel Sarkowicz, Department of Pure Mathematics, University of Waterloo

“Separable Exact C*-Algebras”

Friday, July 26, 2019 — 1:30 PM EDT

Hongdi Huang, Department of Pure Mathematics, University of Waterloo

"The Zariski Cancellation Problem"

Wednesday, July 24, 2019 — 4:30 PM EDT

## Pure Math and C&O Joint Colloquium

Soffia Arnadottir, C&O Department, University of Waterloo

"Graphs in algebra and algebra in graphs"

Tuesday, July 23, 2019 — 2:30 PM EDT

## Geometry & Topology Seminar

Ali Aleyasin, Department of Pure Mathematics, University of Waterloo

"Riemannian cones in disguise: singular elliptic PDEs"

Monday, July 22, 2019 — 1:00 PM EDT

## Valuative Trees Learning Seminar

Brett Nasserden, Department of Pure Mathematics, University of Waterloo

"The valuative tree in action"

Friday, July 12, 2019 — 2:30 PM EDT

## Learning Seminar on Representation Theory of Finite and Infinite Symmetric Groups

Jacob Campbell, Department of Pure Mathematics, University of Waterloo

This is the first meeting of a learning seminar which will run for most of July and August. The proposed day/time for the seminar is on Fridays, 2:30 to 3:30 pm.

In the first few meetings of the seminar we will look at the representation theory of the finite symmetric groups S_n, following the approach of Okounkov and Vershik, which emphasizes the branching rule and the use of Jucys-Murphy elements (all these terms are to be explained as the seminar goes on).

Thursday, July 4, 2019 — 4:00 PM EDT

## Analysis Seminar

Ian Charlesworth, University of California, Berkeley

"Free Stein Irregularity"

Thursday, July 4, 2019 — 10:00 AM EDT

## Computability Learning Seminar

Luke MacLean, Department of Pure Mathematics, University of Waterloo

"Different extensions of first-order logic (part 2)"

Having given definitions and examples of two different extensions of first-order logic, I will proceed to sketch a proof that a computably axiomatizable theory is finitely axiomatizable using additional predicates. Knowledge of the first part is not necessary.

MC 5479

Wednesday, July 3, 2019 — 10:00 AM EDT

## PhD Thesis Defence

Anton Mosunov, Department of Pure Mathematics, University of Waterloo

"Generalizations of the Gap Principle and the Thue-Siegel Principle, With Applications to Diophantine Equations"

Friday, June 28, 2019 — 2:30 PM EDT

## Geometry & Topology Seminar

Sergey Grigorian, University of Texas -- Rio Grande Valley

"Heat Flow of Isometric G2-structures"

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

## Computability Learning Seminar

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.

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

Carlos Valero, Department of Pure Mathematics, University of Waterloo

"Why we Caré about the Poincaré Conjecture?"

Monday, June 24, 2019 — 2:30 PM EDT

## Analysis Seminar

Roger Smith, Texas A&M University

"A Galois correspondence for crossed products"

We consider a discrete group G acting by outer automorphisms on a simple unital C*-algebra A. We address the problem of characterising the C*-algebras lying between A and its crossed product by G. The main result is that these are parameterised by the subgroups of G. This is joint work with Jan Cameron.

MC 5417

Thursday, June 20, 2019 — 4:00 PM EDT

Eric Boulter, Department of Pure Mathematics, University of Waterloo

"The Parallel Postulate: a 2000-year controversy"

Thursday, June 20, 2019 — 10:00 AM EDT

## Computability Learning Seminar

Mohammad Mahmoud, Department of Pure Mathematics, University of Waterloo

"The Isomorphism Problem of the Class of Computable Trees of Finite Rank"

Friday, June 14, 2019 — 10:30 AM EDT

## PhD Thesis Seminar

Samuel Harris, Department of Pure Mathematics, University of Waterloo

"Applying unitary correlations to matrix-valued Tsirelson correlations"

In this talk we’ll explore another application of unitary correlations. We’ll use C*-algebraic analogues of quantum teleportation and super-dense coding to transform non-spatial unitary correlations into a matrix version of non-spatial Tsirelson correlations. On the way, we’ll also find some separations for matrix-valued Tsirelson correlations between the quantum and the quantum spatial models.

Thursday, June 13, 2019 — 12:00 PM EDT

## Algebraic Geometry Learning Seminar

Jeff Samuelson, Department of Pure Mathematics, University of Waterloo

"A variety of schemes, part II"

We give the general definition of schemes and discuss several examples.

MC 5479

Thursday, June 13, 2019 — 10:00 AM EDT

## PhD Thesis Defense

Michael Deveau, Department of Pure Mathematics, University of Waterloo

"Computability Theory and Some Applications"

Wednesday, June 12, 2019 — 3:00 PM EDT

## Logic Seminar

Valentina Harizanov, George Washington University

"Arithmetically categorical structures"

Tuesday, June 11, 2019 — 2:30 PM EDT

## Algebra Seminar

Sylvie Davis, Department of Pure Mathematics, University of Waterloo

"Monoids, Computation, and the State Complexity of Regular Languages"

Tuesday, June 11, 2019 — 2:00 PM EDT

## PhD Thesis Defence

Nickolas Rollick, Department of Pure Mathematics, University of Waterloo

"Approximation Constants for Closed Subschemes of Projective Varieties"

Tuesday, June 11, 2019 — 12:00 PM EDT

## Algebraic Geometry Learning Seminar

Diana Castaneda Santos, Department of Pure Mathematics, University of Waterloo

"A variety of schemes"

in this talk we will define  schemes. We will see some examples of schemes that are not affine schemes. Next, we will study properties of  locally ringed spaces and stalks of schemes along with their residue fields. Finally, we will see how to glue schemes and depending on the gluing we can have different types of schemes.

MC 5479

Tuesday, June 11, 2019 — 9:30 AM EDT

## Geometry Working Seminar

Christopher Lang, Department of Pure Mathematics, University of Waterloo

In my last talk, we examined how group actions simplify the Nahm equations.  In this talk, we outline the procedure that generates monopoles from solutions of these equations, the ADHM-Nahm procedure.  Then, using Maple,, we follow this procedure to generate explicit examples of monopoles.

Spencer Whitehead, Department of Pure Mathematics, University of Waterloo

'Decorated Coxeter Diagrams'

Thursday, June 6, 2019 — 12:00 PM EDT

## Algebraic Geometry Learning Seminar

Carlos Valero, Department of Pure Mathematics, University of Waterloo

This will be a continuation of Tuesday's talk.

MC 5479

Tuesday, June 4, 2019 — 1:30 PM EDT

## Number Theory Seminar

Anton Mosunov, Department of Pure Mathematics, University of Waterloo

"Absolute Bounds on the Number of Solutions of Certain Equations of Thue and Thue-Mahler Type"

Let $F(X, Y)$ be an irreducible polynomial with integer coefficients of degree at least three. In 1909 it was proved by Thue that the Diophantine equation

$$F(x, y) = m,$$

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