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Wednesday, September 16, 2026 2:30 pm - 3:30 pm EDT (GMT -04:00)

Pure Mathematics Colloquium | Yasuyuki Kawahigashi | Operator algebras, conformal field theory and condensed matter physics

Yasuyuki Kawahigashi (University of Tokyo)

Operator algebras, conformal field theory and condensed matter physics

We present an operator algebraic approach to conformal field theory in connection to other topics such as vertex operator algebras, quantum groups and quantum invariants in low-dimensional topology, which started with subfactor theory of Jones. We then present recent advances on similar mathematical structures that appear in two-dimensional condenses matter physics such as quantum spin systems, tensor networks and topological quantum computation. No knowledge on operator algebras are assumed.
MC 5479
Thursday, September 17, 2026 1:30 pm - 3:00 pm EDT (GMT -04:00)

Computability Learning Seminar | Joey Lakerdas-Gayle | The Game Metatheorem

Joey Lakerdas-Gayle (University of Waterloo)
The Game Metatheorem
The Game Metatheorem is a framework for constructing computable structures as a game between players using noncomputable \(\Delta^0_\eta\) information for a transfinite ordinal \(\eta\). We will introduce the Game Metatheorem following Montalbán's second computable structure theory book, and use it to prove the pairs of structures theorem.
MC 5301
Thursday, September 17, 2026 3:00 pm - 4:00 pm EDT (GMT -04:00)

Model Theory Seminar | Yutong Duan | Strongly Minimal Sets in DCF_0

Yutong Duan (University of Waterloo)

Strongly Minimal Sets in DCF_0

We introduce the theory of differentially closed fields of characteristic zero (DCF_0) and the pregeometry associated with minimal types, and explain how strong minimality connects questions about ordinary differential equations with model theory.

MC 5403

Tuesday, September 22, 2026 1:30 pm - 2:30 pm EDT (GMT -04:00)

Algebra Seminar | Tariq Syed | Vector bundles over topologically contractible smooth affine complex varieties

Tariq Syed (Heinrich-Heine-Universität Düsseldorf) 

Vector bundles over topologically contractible smooth affine complex varieties

A smooth complex variety X is called topologically contractible if its set of complex points, viewed as a complex manifold with analytic topology, is a contractible topological space. The primordial examples of topologically contractible smooth affine complex varieties are given by affine spaces. The generalized Serre question on algebraic vector bundles asks whether algebraic vector bundles over topologically contractible smooth affine complex varieties are always trivial. In this talk, we survey classical results and highlight the most recent developments on this problem.

MC 5479

Friday, September 25, 2026 12:00 pm - 1:00 pm EDT (GMT -04:00)

Intro to My Research | Michael Rubinstein

Michael Rubinstein (University of Waterloo)

Intro to My Research

This is a series of talks by faculty members explaining their research at a level aimed at master's students. All other department members are welcome as well.

MC 5417

Thursday, October 1, 2026 2:30 pm - 3:30 pm EDT (GMT -04:00)

Intro to My Research | Spiro Karigiannis

Spiro Karigiannis (University of Waterloo)

Intro to My Research

This is a series of talks by faculty members explaining their research at a level aimed at master's students. All other department members are welcome as well.

MC 5501

Thursday, October 8, 2026 2:30 pm - 3:30 pm EDT (GMT -04:00)

Intro to My Research | Jason Bell

Jason Bell (University of Waterloo)

Intro to My Research

This is a series of talks by faculty members explaining their research at a level aimed at master's students. All other department members are welcome as well.

MC 5501