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Please note: The University of Waterloo is closed for all events until further notice.

# Events by month

## October 2014

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### Algebra learning seminar

Wednesday, October 1, 2014 — 1:30 PM EDT

Ty Ghaswala, Department of Pure Mathematics, University of Waterloo

“It will be OK: The adventures of K0”

### Student colloquium

Thursday, October 2, 2014 — 4:30 PM EDT

Ian Payne, Department of Pure Mathematics, University of Waterloo

“Normal Subgroups, Ideals, and Kernels”

### Geometry working seminar

Friday, October 3, 2014 — 1:00 PM EDT

Ehsaan Hossain, Department of Pure Mathematics, University of Waterloo

“Defining Schemes: The Home Stretch”

### Analysis seminar

Friday, October 3, 2014 — 3:30 PM EDT

Dilian Yang, University of Windsor

“Cycline subalgebras of k-graph C*-algebras”

### Geometry working seminar

Tuesday, October 7, 2014 — 1:00 PM EDT

Jon Herman, Pure Mathematics Department, University of Waterloo

“Gauss’s Theorema Egregium”

### Geometry working seminar

Tuesday, October 7, 2014 — 1:00 PM EDT

Jon Herman, Pure Mathematics Department, University of Waterloo

“Gauss’s Theorema Egregium”

### Algebra learning seminar

Wednesday, October 8, 2014 — 1:30 PM EDT

Philip Xiao, Department of Pure Mathematics, University of Waterloo

“K0 continued”

### Algebraic Geometry learning seminar

Friday, October 10, 2014 — 1:00 PM EDT

Ty Ghaswala, Department of Pure Mathematics, University of Waterloo

“Intro-spec-tion”

So far we have been streaming ahead, defining an affine scheme without a moment’s hesitation. It is time to take a moment to still our minds and reflect.

### Geometry & Topology seminar

Friday, October 10, 2014 — 2:30 PM EDT

Romina Arroyo, McMaster University

“Homogeneous Ricci solitons and the Alekseevskii conjecture in low dimensions”

### Analysis seminar

Friday, October 10, 2014 — 3:30 PM EDT

Raphael Clouatre, Department of Pure Mathematics, University of Waterloo

“Henkin measures for the multiplier algebra of the Drury-Arveson space”

### Universal Algebra seminar

Tuesday, October 14, 2014 — 10:30 to 10:30 AM EDT

Ross Willard, Department of Pure Mathematics, University of Waterloo

“Adding Gaussian elimination to local consistency checking”

### Geometry working seminar

Tuesday, October 14, 2014 — 1:00 PM EDT

Spiro Karigiannis, Pure Mathematics Department, University of Waterloo

“The first and second variation formulas for the volume functional in Riemannian geometry”

### Algebra learning seminar

Wednesday, October 15, 2014 — 1:30 PM EDT

Ritvik Ramkumar, Department of Pure Mathematics, University of Waterloo

“More K0”

Continuing where Philip left off, we will finish talking about K0of local rings and Dedekind domains.

### Algebra seminar

Wednesday, October 15, 2014 — 2:30 PM EDT

Jason Bell, Department of Pure Mathematics, University of Waterloo

“Etale Groupoid algebras, II: Leavitt path algebras”

### Logic seminar

Wednesday, October 15, 2014 — 3:30 PM EDT

Rahim Moosa, Department of Pure Mathematics, University of Waterloo

“A model theory for meromorphic dynamics?”

### Number Theory seminar

Thursday, October 16, 2014 — 1:30 PM EDT

Fang Song, Institute for Quantum Computing University of Waterloo

“An efficient quantum algorithm for computing the unit group of an arbitrary degree number field”

### Geometry working seminar

Friday, October 17, 2014 — 1:00 PM EDT

Shuntaro Yamagishi, Pure Mathematics, University of Waterloo

"Five or six things Ehsaan wants me to talk about"

Ehsaan gave me a list of five or six things he wants me to talk about this Friday. The list includes: the definition of ringed spaces, locally ringed spaces, schemes; an example of a non-affine scheme, etc. I plan to talk about these things.

### Analysis seminar

Friday, October 17, 2014 — 3:30 PM EDT

"Cartan Pairs and Extensions of Inverse Semigroups”

### Pure Math colloquium

Monday, October 20, 2014 — 4:00 PM EDT

Jacob Tsimmerman, University of Toronto

“Bounding Torsion in Geometric Families of Abelian Varieties”

### Geometry & Topology seminar

Tuesday, October 21, 2014 — 1:00 PM EDT

Jason Lotay, University College London

“Hyperkaehler 4-manifolds with boundary”

### Computability learning seminar

Tuesday, October 21, 2014 — 3:30 PM EDT

Mohammad Mahmoud, Pure Mathematics, University of Waterloo

"Torsion-free groups: linear independence and computable categoricity"

### Universal Algebra seminar

Tuesday, October 21, 2014 — 10:30 PM EDT

Ross Willard, Pure Mathematics, University of Waterloo

"Adding Gaussian elimination to local consistency checking - 2"

In this second of several lectures, I will present a polynomial-time consistency checking algorithm for constraint networks over a finite template having a Taylor polymorphism. I conjecture that the algorithm is complete for Maltsev templates, and in future lectures will provide evidence supporting this conjecture.

### Number Theory seminar

Thursday, October 23, 2014 — 1:30 PM EDT

Jonas Jankauskas, Pure Mathematics, University of Waterloo

"There are no two non-real conjugates of a Pisot number with the same imaginary part"

Thursday, October 23, 2014 — 4:30 PM EDT

Jonathan Herman, Pure Mathematics, University of Waterloo

"The Curvature of Curves and Surfaces"

### Geometry working seminar

Friday, October 24, 2014 — 1:00 PM EDT

Ruxandra Moraru, Department of Pure Mathematics, University of Waterloo

“Varieties versus schemes”

Last week, we saw the definition of a scheme. In this weeks talk, well present more examples of schemes and illustrate how, in some cases, schemes provide a better framework than varieties for studying certain geometric questions.

### Geometry & Topology seminar

Friday, October 24, 2014 — 2:30 PM EDT

Francesco Sala, University of Western Ontario

“Sheaves on root stacks and Nakajima quiver varieties”

### Analysis seminar

Friday, October 24, 2014 — 3:30 PM EDT

Matthew Wiersma, Pure Mathematics, University of Waterloo

"Intermediate $C^*$-norms"

### Pure Math colloquium

Monday, October 27, 2014 — 4:00 PM EDT

Denis Hirschfeldt, University of Chicago

"Computable Mathematics and Reverse Mathematics"

### Universal Algebra Seminar

Tuesday, October 28, 2014 — 10:30 to 10:30 AM EDT

Ross Willard, Department of Pure Mathematics, University of Waterloo

“Adding Gaussian elimination to local consistency checking”

### Algebra learning seminar

Wednesday, October 29, 2014 — 1:30 PM EDT

Mohamed El Alami, Department of Pure Mathematics, University of Waterloo

“More K0”

### Logic seminar

Wednesday, October 29, 2014 — 3:30 PM EDT

Denis Hirschfeldt, University of Chicago

“Computability Theoretic Reduction between Pi12Principles”

### Special presentation

Wednesday, October 29, 2014 — 11:30 PM EDT

Phillip Xiao, Department of Pure Mathematics, University of Waterloo

“K-theory for C*-algebras and vector bundles - Part I”

### Geometry working seminar

Friday, October 31, 2014 — 1:00 PM EDT

Ruxandra Moraru, Department of Pure Mathematics, University of Waterloo

“Varieties versus schemes, Part II”

### Geometry & Topology seminar

Friday, October 31, 2014 — 2:30 PM EDT

Alan Thompson, Department of Pure Mathematics, University of Waterloo

“Calabi-Yau threefolds fibred by lattice polarized K3 surfaces”

### October 2014

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