# Events - April 2019

Thursday, April 25, 2019 — 3:00 PM EDT

## Geometry & Topology Seminar

**Rescheduled from April 19. Note new day/time/room**

Shubham Dwivedi, Department of Pure Mathematics, University of Waterloo

"A gradient flow of isometric $G_2$ structures"

Wednesday, April 17, 2019 — 3:30 PM EDT

## Computability Learning Seminar

Michael Deveau, Department of Pure Mathematics, University of Waterloo

"Non-triviality of the Bounded Jump Hierarchy - Part 3"

We finish the proof that for all $B$, there is some set $A$ with $B <_{bT} A <_{bT} B^b$. We determine $\hat{h}_A$ and $\hat{h}_C$ as promised, taking into account the restrictions imposed by the construction, and prove that our choices are correct.

MC 5413

Monday, April 15, 2019 — 11:30 AM EDT

## Model Theory Seminar

Nigel Pynn-Coates, University of Illinois at Urbana-Champaign

"Asymptotic valued differential fields and differential-henselianity"

Wednesday, April 10, 2019 — 3:30 PM EDT

## Analysis Seminar

Clifford Bearden, University of Texas at Tyler

"A module version of the weak expectation property"

Wednesday, April 10, 2019 — 3:30 PM EDT

## Computability Learning Seminar

Michael Deveau, Department of Pure Mathematics, University of Waterloo

"Non-triviality of the Bounded Jump Hierarchy - Part 2"

We continue with the proof that for all $B$, there is some set $A$ with $B <_{bT} A <_{bT} B^b$. We start the main construction itself, check that the requirements eventually settle and are met, and we investigate the correct $\hat{h}_A$ and $\hat{h}_C$ as promised.

MC 5413

Friday, April 5, 2019 — 2:30 PM EDT

## Geometry & Topology Seminar

Spiro Karigiannis, Department of Pure Mathematics, University of Waterloo

"A curious system of second order nonlinear PDEs for $\mathrm{U}(m)$-structures on manifolds"

Thursday, April 4, 2019 — 12:00 PM EDT

Nick Manor, Unviersity of Waterloo

"Exact Groups"

There are two notions of exactness for groups, but they are not known to be equivalent outside the discrete case. I will show how we can extend this equivalence to include two larger classes of groups.

MC 5403

Wednesday, April 3, 2019 — 4:30 PM EDT

## Pure Math and C&O Joint Colloquium

Ben Moore, University of Waterloo

"A proof of the Hell-Neˇsetˇril Dichotomy via Siggers Polymorphism"

Wednesday, April 3, 2019 — 3:30 PM EDT

## Analysis Seminar

Gholamreza Aghamollaei, Shahid Bahonar University of Kerman, Iran

"The numerical range of quaternion matrices with respect to involutions"

Wednesday, April 3, 2019 — 3:30 PM EDT

## Computability Learning Seminar

Michael Deveau, Department of Pure Mathematics, University of Waterloo

“Non-triviality of the Bounded Jump Hierarchy - Part 1”

Monday, April 1, 2019 — 4:00 PM EDT

## Pure Math Colloquium

Jan Minac, University of Western Ontario

"The 13th mysterious room of a palace of absolute Galois groups"

### May 2019

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