Events by month

November 2022

Tuesday, November 1, 2022 — 10:00 to 10:00 AM EDT

Jérémy Champagne, Department of Pure Mathematics, University of Waterloo

"Interesting results in equidistribution theory"

An infinite sequence is equidistributed in an interval if the "proportion" of its points lying in any given sub-interval corresponds roughly to the length of the sub-interval. In a sense, this can be regarded as an "almost randomness" property, and sometimes shows up naturally in analytic number theory.

Tuesday, November 1, 2022 — 12:30 to 12:30 PM EDT

Yunhai Xiang, Department of Pure Mathematics, University of Waterloo

"Introduction to derived categories"

Tuesday, November 1, 2022 — 2:00 PM EDT

Spiro Karigiannis, Department of Mathematics, University of Waterloo

"Cohomologies on almost complex manifolds and their applications"

Thursday, November 3, 2022 — 1:00 PM EDT

Changho Han, Department of Pure Mathematics, University of Waterloo

"Divisors and line bundles on horospherical varieties"

Using the presentation of horospherical varieties as coloured fans, I will present how to describe Borel-invariant Weil and Cartier divisors combinatorically. Then I will give a description of the Picard group of horospherical varieties and detect geometric properties of them.

This seminar will be held jointly online and in person:

Thursday, November 3, 2022 — 2:30 PM EDT

Jiasheng Teh, McMaster University

"On moduli spaces of Ricci-flat 4-manifolds"

Friday, November 4, 2022 — 10:30 to 10:30 AM EDT

Rahim Moosa, Department of Pure Mathematics, University of Waterloo

"When any two solutions are independent"

Friday, November 4, 2022 — 3:00 PM EDT

Kieran Mastel, Department of Pure Mathematics, University of Waterloo

"Surreal Numbers and Games"

Tuesday, November 8, 2022 — 12:30 to 12:30 PM EST

Francisco Villacis, Department of Pure Mathematics, University of Waterloo

"An Introduction to Gromov-Witten Invariants and Quantum Cohomology"

Tuesday, November 8, 2022 — 2:00 PM EST

Christopher Lang, Department of Pure Mathematics, University of Waterloo

"Hyperbolic Monopoles with Continuous Symmetries"

We examine hyperbolic monopoles with continuous symmetries and develop a structure theorem which generates spherically symmetric hyperbolic monopoles. To do this, we modify the steps laid out in a collaborative paper of mine wherein we proved a similar structure theorem for Euclidean monopoles. We discuss how these steps may be applied to other gauge theoretic objects.

Thursday, November 10, 2022 — 10:30 to 10:30 AM EST

Xinyue (Cynthia) Xie & Layth Al-Hellawi, Department of Pure Mathematics, University of Waterloo

"Effectiveness Properties of Walker's Cancellation Theorem - Part I"

Thursday, November 10, 2022 — 1:00 PM EST

Changho Han, Department of Pure Mathematics, University of Waterloo

"Divisors and line bundles on horospherical varieties II"

Thursday, November 10, 2022 — 2:30 PM EST

Ty Ghaswala, CEMC, University of Waterloo

"Boundary Dehn twists are excellent!"

Friday, November 11, 2022 — 10:30 to 10:30 AM EST

Barbara Csima, Department of Pure Mathematics, University of Waterloo

"Degrees of Categoricity"

A degree of categoricity is a Turing degree that exactly captures the complexity of computing isomorphisms between computable copies of some computable structure. In this talk I will start by giving some easy examples of degrees of categoricity. I will then give a review of what is known about degrees of categoricity, culminating in new results (joint work with Dino Rossegger).

Tuesday, November 15, 2022 — 10:00 to 10:00 AM EST

Yash Totani, Department of Pure Mathematics, University of Waterloo

"A function field analogue of Landau's theorem"

A famous theorem of Landau classifies the numbers which can be written as the sum of two squares and provides the asymptotic density of such numbers in the set of integers. In this talk, we will be looking at a function field analogue due to Soroker, Smilansky and Wolf.

This seminar will be held jointly online and in person:

Tuesday, November 15, 2022 — 2:00 PM EST

Anton Iliashenko, Department of Pure Mathematics, University of Waterloo

"Betti numbers of nearly G2 manifolds"

On a Riemannian manifold there is a Weitzenböck identity which is a relationship between the Laplacian, the Bochner Laplacian and the curvature. We will consider this formula in the nearly G_2 setting and see how bounds on the Weyl Tensor or Sectional Curvature can give us certain information about the Betti numbers.

MC 5403

Thursday, November 17, 2022 — 10:30 to 10:30 AM EST

Xinyue (Cynthia) Xie & Layth Al-Hellawi, Department of Pure Mathematics, University of Waterloo

"Effectiveness properties of the Walker's Cancellation Theorem - Part II"

Thursday, November 17, 2022 — 1:00 PM EST

Matthew Satriano, Department of Pure Mathematics, University of Waterloo

"The canonical divisor and properties of Cartier divisors for horospherical varieties"

We will discuss criteria for Cartier divisors to be base point free or ample. We will also give a formula for the canonical divisor. We will include many examples.

This seminar will be held jointly online and in person:

Thursday, November 17, 2022 — 2:30 PM EST

Sung Gi Park, Harvard University

"Kodaira dimension and hyperbolicity for smooth families of varieties"

Friday, November 18, 2022 — 10:30 to 10:30 AM EST

Patrick Speissegger, McMaster University

"The real Gamma and Zeta functions are jointly o-minimal"

Monday, November 21, 2022 — 2:30 PM EST

Jenna Rajchgot, McMaster University

"Symmetric quivers and symmetric varieties"

Tuesday, November 22, 2022 — 12:30 to 12:30 PM EST

Aiden Suter, Department of Pure Mathematics, University of Waterloo

"A brief overview of algebraic Fedosov quantization"

Tuesday, November 22, 2022 — 2:00 PM EST

Brady Ali Medina, Department of Pure Mathematics, University of Waterloo

"Lifting a co-Higgs field to a Poisson structure"

Tuesday, November 22, 2022 — 2:30 PM EST

Julie Desjardins, University of Toronto Mississauga

"Torsion points and concurrent exceptional curves on del Pezzo surfaces of degree one"

The blow up of the anticanonical base point on X, a del Pezzo surface of degree 1, gives rise to a rational elliptic surface E with only irreducible fibers. The sections of minimal height of E are in correspondence with the 240 exceptional curves on X. A natural question arises when studying the configuration of those curves : 

Thursday, November 24, 2022 — 10:30 to 10:30 AM EST

Xinyue (Cynthia) Xie & Layth Al-Hellawi, Department of Pure Mathematics, University of Waterloo

"Effectiveness properties of the Walker's Cancellation Theorem - Part III"

Thursday, November 24, 2022 — 1:00 PM EST

Matthew Satriano, Department of Pure Mathematics, University of Waterloo

"The canonical divisor and properties of Cartier divisors for horospherical varieties"

We will discuss criteria for Cartier divisors to be base point free or ample. We will also give a formula for the canonical divisor. We will include many examples.

This seminar will be held jointly online and in person:

Thursday, November 24, 2022 — 2:30 PM EST

Daniel Alvarez, University of Toronto

"On generalized Kähler structures and Lie brackets"

Thursday, November 24, 2022 — 4:30 PM EST

Brady Ali Medina, Department of Pure Mathematics, University of Waterloo

"Sidon Sets"

Monday, November 28, 2022 — 2:30 PM EST

Catherine Pfaff, Queen's University

"Deformation Spaces, R-Trees, & What Happens When You Iterate a Free Group Automorphism"

Tuesday, November 29, 2022 — 10:00 to 10:00 AM EST

James Houle, Department of Pure Mathematics, University of Waterloo

"Brun's Sieve and it's applications to the Twin Prime Conjecture"

For hundreds, if not thousands of years, people have been trying to work out whether or not the Twin Prime Conjecture is true. However, it wasn't until the early 1900s when Viggo Brun introduced his sieve that real progress towards the conjecture was made. This talk will introduce Brun's Sieve and use it to show some of the earliest steps that were made towards proving the Twin Prime Conjecture.

Tuesday, November 29, 2022 — 12:30 to 12:30 PM EST

Dongshu Dai, Department of Pure Mathematics, University of Waterloo

"Tropical Curves and Where to Find Them"

Tuesday, November 29, 2022 — 2:00 PM EST

Michael Albanese, Department of Pure Mathematics, University of Waterloo

"Almost Complex Four-Manifolds with no Complex Structure"

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