# Events

## September 2019

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### Colloquium

Monday, September 9, 2019 — 4:00 PM EDT

Shai Ben-David, School of Computer Science, University of Waterloo

"A basic machine learning problem is independent of set theory"

Thursday, September 12, 2019 — 4:30 PM EDT

Adina Goldberg, Department of Pure Mathematics, University of Waterloo

"This title contains information"

How can we mathematically test the claim made in the title? In this talk, we will learn about Claude Shannon's entropy and determine if it gives us the best measure of informativeness. If you can picture the graph of a logarithm, you are well prepared.

MC 5501

### Number Theory Seminar

Tuesday, September 17, 2019 — 1:30 PM EDT

J.C. Saunders, Ben Gurion University of Negev

"Diophantine equations involving the Euler totient function"

We deal with various Diophantine equations involving the Euler totient function. In particular, for $a,b,c,m,n\in\mathbb{N}$ with $m\geq 2$ we study the equations $\varphi(ax^m)=\frac{b\cdot n!}{c}$ and $\varphi\left(\frac{b\cdot n!}{c}\right)=ax^m$ where $\varphi(x)$ is the Euler totient function. We also deal with similar equations involving Lucas sequences of the first kind and second kind, generalising the work of Luca and Stanica.

### Computability Learning Seminar

Tuesday, September 17, 2019 — 2:00 PM EDT

Dino Rossegger, Department of Pure Mathematics, University of Waterloo

"The complexity of Scott sentences of scattered linear orders"

### Analysis Seminar

Wednesday, September 18, 2019 — 3:30 PM EDT

Aasaimani Thamizhazhagan, Department of Pure Mathematics, University of Waterloo

"On the structure of invertible elements in Fourier-Stieltjes algebras"

Thursday, September 19, 2019 — 1:00 PM EDT

Adam Humeniuk, Department of Pure Mathematics, University of Waterloo

"C*-covers of semicrossed products"

### Valuative Tree Seminar

Monday, September 23, 2019 — 2:30 PM EDT

**Note time and room change**

Ehsaan Hossain, Department of Pure Mathematics, University of Waterloo

"Introduction to the valuative tree"

### Colloquium

Monday, September 23, 2019 — 4:00 PM EDT

Alex Iosevich, University of Rochester

"Analytic, geometric and combinatorial aspects of the Falconer distance conjecture"

### Computability Learning Seminar

Tuesday, September 24, 2019 — 2:00 PM EDT

Dino Rossegger, Department of Pure Mathematics, University of Waterloo

"The complexity of Scott sentences of scattered linear orders -- Part II"

### Analysis Seminar

Wednesday, September 25, 2019 — 3:30 PM EDT

Mizanur Rahaman, Department of Pure Mathematics, University of Waterloo

"Bisynchronous games and factorizable maps"

### Model Theory Learning Seminar

Thursday, September 26, 2019 — 11:00 to 11:00 AM EDT

Wilson Poulter, Department of Pure Mathematics, University of Waterloo

"NIP II"

We finish up section 2.1 and begin section 2.2 of Simon's Guide to NIP theories.

MC 5413

### PhD Thesis Defence

Friday, September 27, 2019 — 11:00 to 11:00 AM EDT

Sylvie Davies, Department of Pure Mathematics, University of Waterloo

"Algebraic Approaches to State Complexity of Regular Operations"

### Valuative Tree Seminar

Monday, September 30, 2019 — 11:30 to 11:30 AM EDT

Brett Nasserden, Department of Pure Mathematics, University of Waterloo

"The valuative tree at infinity"

To study the dynamics of a polynomial map on the complex affine plane we must be able to study the behavior of the mapping near the origin and near infinity. The study of the dynamics near a point leads to the notion of the valuative tree at the origin of the affine plane. To study the dynamics near infinity, we introduce a new but analogous object,the valuative tree at infinity, which will be the subject of this lecture.

MC 5403

### September 2019

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