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Please note: The University of Waterloo is closed for all events until further notice.

# Events by month

## June 2019

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### Geometry Working Seminar

Tuesday, June 4, 2019 — 9:30 AM EDT

Speaker 1: Patrick Naylor, Department of Pure Mathematics, University of Waterloo

"Handles and Kirby diagrams"

Ever wanted to represent a manifold with a diagram? Via several examples, this talk will explain how low dimensional manifolds and the relationships between them can be described by Kirby diagrams. We will review the necessary Morse theory to describe handle decompositions, and then use this to draw many pictures.

Speaker 2: Jason d'Eon, Department of Pure Mathematics, University of Waterloo

### Algebraic Geometry Learning Seminar

Tuesday, June 4, 2019 — 12:00 to 12:00 PM EDT

Jeffrey Samuelson, Department of Pure Mathematics, University of Waterloo

"An Agrarian Interlude"

### Number Theory Seminar

Tuesday, June 4, 2019 — 1:30 PM EDT

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

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

### Algebraic Geometry Learning Seminar

Thursday, June 6, 2019 — 12:00 to 12:00 PM EDT

Carlos Valero, Department of Pure Mathematics, University of Waterloo

This will be a continuation of Tuesday's talk.

MC 5479

### Geometry Working Seminar

Tuesday, June 11, 2019 — 9:30 AM EDT

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'

### Algebraic Geometry Learning Seminar

Tuesday, June 11, 2019 — 12:00 to 12:00 PM EDT

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

### PhD Thesis Defence

Tuesday, June 11, 2019 — 2:00 PM EDT

Nickolas Rollick, Department of Pure Mathematics, University of Waterloo

"Approximation Constants for Closed Subschemes of Projective Varieties"

### Algebra Seminar

Tuesday, June 11, 2019 — 2:30 PM EDT

Sylvie Davis, Department of Pure Mathematics, University of Waterloo

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

### Logic Seminar

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

Valentina Harizanov, George Washington University

"Arithmetically categorical structures"

### PhD Thesis Defense

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

Michael Deveau, Department of Pure Mathematics, University of Waterloo

"Computability Theory and Some Applications"

### Algebraic Geometry Learning Seminar

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

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

### PhD Thesis Seminar

Friday, June 14, 2019 — 10:30 to 10:30 AM EDT

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.

### Computability Learning Seminar

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

Mohammad Mahmoud, Department of Pure Mathematics, University of Waterloo

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

Thursday, June 20, 2019 — 4:00 PM EDT

Eric Boulter, Department of Pure Mathematics, University of Waterloo

"The Parallel Postulate: a 2000-year controversy"

### Analysis Seminar

Monday, June 24, 2019 — 2:30 PM EDT

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

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

Carlos Valero, Department of Pure Mathematics, University of Waterloo

"Why we Caré about the Poincaré Conjecture?"

### Computability Learning Seminar

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

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.

### Geometry & Topology Seminar

Friday, June 28, 2019 — 2:30 PM EDT

Sergey Grigorian, University of Texas -- Rio Grande Valley

"Heat Flow of Isometric G2-structures"

### June 2019

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