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# Events by month

## April 2018

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### Baker-DeMarco Learning Seminar

Tuesday, April 3, 2018 — 1:30 PM EDT

Jason Bell, Department of Pure Mathematics, University of Waterloo

"Last talk of the seminar"

MC 5479

### Algebraic Geometry Learning Seminar

Tuesday, April 3, 2018 — 3:00 PM EDT

Farida Shahata, Department of Pure Mathematics, University of Waterloo

"More projective geometry"

Projective schemes make a comeback! Following our previous discussion on closed immersions and closed subschemes, the next natural step is to study closed embeddings of projective schemes.

As for affine schemes, we will see that a surjection of graded rings induces a closed embedding of projective schemes. Conversely, every closed subscheme of a projective scheme arises from a graded ideal, hence, is projective itself.

Wednesday, April 4, 2018 — 4:00 PM EDT

Seda Albayrak, Department of Pure Mathematics, University of Waterloo

"Finite Automata and Transcendence Theory"

### Computability Learning Seminar

Thursday, April 5, 2018 — 10:30 to 10:30 AM EDT

Barbara Csima, Department of Pure Mathematics, University of Waterloo

"Every $\Delta^0_2$ degree is a strong degree of categoricity"

We sketch the proof that  every $\Delta^0_2$ degree is a strong degree of categoricity. This is joint work with Keng Meng Ng.

MC 5417

### Universal Algebra Seminar

Friday, April 6, 2018 — 2:00 PM EDT

Ross Willard, Department of Pure Mathematics, University of Waterloo

"Uncountable SIs in residually small varieties in a countable signature"

### Analysis Seminar

Friday, April 6, 2018 — 2:30 PM EDT

Mahya Ghandehari, University of Delaware

"Characterizing the Sobolev wavefront set via continuous wavelet transforms"

### Geometry & Topology Seminar

Friday, April 6, 2018 — 2:30 PM EDT

McKenzie Wang, McMaster University

"Examples of Ancient Flows on Bundles"

I will report on joint work with Peng Lu on constructing ancient flows on a large class of compact bundles. These examples are of type I and include both collapsed and non-collapsed cases. In special cases, we can also describe the forwards limit of these ancient flow. As a bonus of this work, we also obtain examples of such ancient flows for pseudo-Riemannian metrics.

MC 5403

### Pure Math Colloquium

Monday, April 9, 2018 — 4:00 PM EDT

Hanfeng Li, SUNY Buffalo

"Mean dimension and von Neumann-Lueck rank"

Mean dimension is an invariant in topological dynamics, while von Neumann-Lueck rank is an invariant in L2-invariants theory, closely related to the L2-Betti numbers. Based on joint work with Bingbing Liang, I will discuss how these two invariants are related to each other.

MC 5501

### Number Theory Seminar

Tuesday, April 10, 2018 — 1:30 PM EDT

Stan Xiao, University of Oxford

"Binary quartic forms with vanishing J-invariant and the subvariety problem"

### Universal Algebra Seminar

Friday, April 13, 2018 — 2:00 PM EDT

Ross Willard, Department of Pure Mathematics, University of Waterloo

"Uncountable SIs in residually small varieties in a countable signature, part II"

Continuing the proof of "the theorem" of McKenzie and Shelah, I will prove some properties of pp-1-types in subdirectly irreducible algebras whose monolith is (0,1)-generated.

MC 5479

### Oral Comprehensive Talks

Monday, April 16, 2018 — 10:00 to 10:00 AM EDT

Jitendra Prakash, Department of Pure Mathematics, University of Waterloo

"Review of Reproducing Kernel Hilbert Spaces"

In this talk we shall review some of the basic results in the theory of reproducing kernel Hilbert spaces and their multiplier algebras.

MC 5403

### Oral Comprehensive Talks

Tuesday, April 17, 2018 — 10:00 to 10:00 AM EDT

Jitendra Prakash, Department of Pure Mathematics, University of Waterloo

"Nevanlinna-Pick Interpolation Problems"

Nevanlinna-Pick interpolation problem seeks a holomorphic function on the unit disk of norm at most one which interpolates two sets of points. This problem can be viewed as a question about the multiplier algebra of the Hardy space. We shall outline this operator-theoretic approach.

MC 5417

### Oral Comprehensive Talks

Wednesday, April 18, 2018 — 10:00 to 10:00 AM EDT

Jitendra Prakash, Department of Pure Mathematics, University of Waterloo

"Factorisation problems in RKHS"

We introduce the problem of factorisation of a positive operator P as P=UU* where U is upper triangular, and relate it to RKHS. We shall also discuss some generalisations of the classical Fejer-Riesz theorem.

MC 5403

### April 2018

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