# Events

## November 2019

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### Computability Learning Seminar

Tuesday, November 5, 2019 — 2:00 PM EST

Luke MacLean, Department of Pure Mathematics, University of Waterloo

"Reverse Mathematics"

We say that $S \subseteq \mathcal{P}(\omega)$ is an $\omega$-model of a subsystem of second order arithmetic if the $L_2$ structure $(\omega, S, +, \cdot, 0, 1, <)$ correctly models the subsystem in question. The goal of this lecture will be to prove that there is an $\omega$-model of $WKL_0$ consisting entirely of low sets.

This will involve learning about PA degrees and the low basis theorem.

All are welcome.

MC 5413

### Valuative Tree Seminar

Tuesday, November 5, 2019 — 2:30 PM EST

Andrej Vukovic, Department of Pure Mathematics, University of Waterloo

We continue where last week's discussion left off by discussing the classification of semivaluations in the valuative tree. Then we return to our study of plane polynomial dynamics.

M3 3103

### Analysis Seminar

Wednesday, November 6, 2019 — 3:30 PM EST

Alexandru Nica, Department of Pure Mathematics, University of Waterloo

"Free probabilistic aspects of meandric systems"

### Model Theory Learning Seminar

Thursday, November 7, 2019 — 11:00 to 11:00 AM EST

Wilson Poulter, Department of Pure Mathematics, University of Waterloo

"NIP VI"

We finish section 2.2.2 of Simon's Guide to NIP theories and move on to 2.2.3.

MC 5413

### Number Theory Seminar

Tuesday, November 12, 2019 — 1:30 PM EST

Arpita Kar, Queen's University

"Some reflections on the Riemann Hypothesis"

### Computability Learning Seminar

Tuesday, November 12, 2019 — 2:00 PM EST

Dino Rossegger, Department of Pure Mathematics, University of Waterloo

"Determinacy in second order arithmetic"

### Special Colloquium

Tuesday, November 12, 2019 — 3:00 PM EST

Daniel Le, University of Toronto

"Congruences between modular forms"

### Analysis Seminar

Wednesday, November 13, 2019 — 3:30 PM EST

Boyu Li, University of Victoria

"Amenable and Non-amenable Semigroups"

Since Nica introduced the notion of amenability of quasi-lattice ordered semigroups, the amenability for many classes of semigroups remain unanswered. We will give a brief overview of semigroup amenability, and show some recent developments on this topic using dilation theory. In particular, we shall show that Artin monoids are non-amenable except the class of right-angled. This is a joint work with Marcelo Laca.

MC 5417

Thursday, November 14, 2019 — 12:00 to 12:00 PM EST

Dan Ursu, Pure Math Department, University of Waterloo

"Relative C*-Simplicity"

### Colloquium

Monday, November 18, 2019 — 4:00 PM EST

Henry Yuen, University of Toronto

"Connes’ Embedding Problem through the lens of complexity theory"

### November 2019

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