April 2019

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Monday, April 1, 2019 — 4:00 PM EDT

Jan Minac, University of Western Ontario

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

Wednesday, April 3, 2019 — 3:30 PM EDT
Gholamreza Aghamollaei, Shahid Bahonar University of Kerman, Iran   "The numerical range of quaternion matrices with respect to involutions"   In this talk, we study some algebraic and geometrical properties of the quaternionic numerical ranges with respect to involutions. We give a description of these sets for 2 by 2 matrices and also for $\phi$-hermitian and $\phi$-skew hermitian quaternion matrices.
Wednesday, April 3, 2019 — 3:30 PM EDT

Michael Deveau, Department of Pure Mathematics, University of Waterloo

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

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

Ben Moore, University of Waterloo

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

Thursday, April 4, 2019 — 12:00 to 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

Friday, April 5, 2019 — 2:30 PM EDT

Spiro Karigiannis, Department of Pure Mathematics, University of Waterloo

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

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

Clifford Bearden, University of Texas at Tyler

"A module version of the weak expectation property"

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

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

Monday, April 15, 2019 — 11:30 to 11:30 AM EDT

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

"Asymptotic valued differential fields and differential-henselianity"

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

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

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

**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"

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