# Events

### Geometric Analysis Seminar

Tuesday, April 25, 2017 - 2:30 PM EDT

Shubham Dwivedi, Department of Pure Mathematics, University of Waterloo

"Simons' Inequality and consequences"

We will prove the Simons' Inequality which is satisfied by the laplacian of the normed square of the second fundamental form of any minimal hypersurface in $\mathbb{R}^n$. We will then prove various consequences of the inequality, including results of Choi and Schoen, Hopf and that of Schoen/Leon Simon/Yau.

MC 5479

### Computability Learning Seminar

Tuesday, April 25, 2017 - 3:30 PM EDT

Michael Deveau, Department of Pure Mathematics, University of Waterloo

"The Slaman-Wehner Family"

We introduce the Slaman-Wehner family, and use it to build a structure with an important property: it has no computable copy, but is computable in any non-computable set. In other words, this structure's degree spectrum is equal to the set of non-computable sets.

MC 5403

### Geometric Analysis Seminar

Thursday, April 27, 2017 - 2:30 PM EDT

Spiro Karigiannis, Department of Pure Mathematics, University of Waterloo

"A new construction of compact $G_2$~manifolds by glueing Eguchi-Hanson spaces, Part I: Overview"

### April 2017

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