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

# Events - July 2013

Tuesday, July 30, 2013 — 3:00 PM EDT

## Model Theory seminar

### Omar Leon Sanchez, Department of Pure Mathematics, University of Waterloo

#### “NIP Theories XX”

We will see why C-minimal theories are dp-mininal, and hence conclude that the theory ACVF is NIP. We will also see why ACFA is ”not” NIP.

Tuesday, July 30, 2013 — 2:30 PM EDT

## Geometry & Topology seminar

### Songhao Li, University of Toronto

#### “Elementary modification of Lie algebroids and the blow-up construction of Lie groupoids”

Tuesday, July 30, 2013 — 1:00 PM EDT

## Geometry working seminar

### Travis Li, University of Toronto

#### “Introduction to Lie groupoids and Lie algebroids”

Monday, July 29, 2013 — 11:30 AM EDT

## Student Number Theory seminar

### Chao Lin, Department of Pure Math, University of Waterloo

#### “Freiman’s Theorem - Part II”

Friday, July 26, 2013 — 3:30 PM EDT

## Analysis seminar

### Hun Hee Lee, Seoul National University

#### "Operator amenability of the $L^1$-algebra of a compact quantum group"

We consider the question of operator amenability of the $L^1$-algebra of a compact quantum group. In order to answer the question we instead look at a related concept of operator biflatness. The final result says for a
compact quantum group $G$, $L^1(G)$ is operator amenable if and only if $G$ is co-amenable and of Kac type, which excludes examples like

Tuesday, July 23, 2013 — 3:00 PM EDT

## Model Theory seminar

### Omar Leon Sanchez, Department of Pure Mathematics, University of Waterloo

#### Title: NIP XIX

We will continue with the proof that the theory of algebraically closed valued fields has NIP. In the way we will talk about strongly dependent theories and dp-minimality.

Tuesday, July 23, 2013 — 1:00 PM EDT

## Geometry working seminar

### Talk #1: "The Lefschetz Theorem on (1,1) Classes" (Zhiyou Wu)

We will discuss and give a proof of a special case of the Hodge conjecture: that for a smooth projective manifold, every (1,1) cohomology class is analytic. We will require some results from Kähler geometry, such as the Hodge-Dolbeault decomposition, which will be stated and their proofs sketched. If time permits we will make further remarks about the general Hodge conjecture.

Monday, July 22, 2013 — 11:30 AM EDT

## Student Number Theory seminar

### Chao Lin, Department of Pure Mathematics, University of Waterloo

#### "Freiman's Theorem - Part I"

For a set of numbers $A$, let the sum-set $A+A$ denote

Friday, July 19, 2013 — 3:30 PM EDT

## Analysis seminar

### George Hutchinson, Department of Pure Math, University of Waterloo

#### “Almost Commuting Matrices and Lin’s Theorem”

Thursday, July 18, 2013 — 3:30 PM EDT

## Geometry & Topology seminar

### Matthew B. Young, Stony Brook University

#### “Representations of Hall algebras and some applications”

Tuesday, July 16, 2013 — 3:00 PM EDT

## Model Theory seminar

### Omar Leon, Sanchez Department of Pure Mathematics, University of Waterloo

#### “NIP Theories XVIII”

We will take a step aside from Chapter 4 of Simon’s note, and jump the appendix to see why the theory of algebraically closed valued fields is NIP. Also, I will talk on why the model companion of difference fields is not NIP.

Monday, July 15, 2013 — 11:30 PM EDT

## Student Number Theory seminar

### J.C. Saunders, Department of Pure Math, University of Waterloo

#### "Sums of Digits in q-ary expansions Part 2"

Let sq(n) denote the sum of the digits of a number n in base q. For example, s2(n) represents the number of 1s in the binary expansion of n. In 1978, Kenneth B. Stolarsky showed that lim inf n!1 s2(n2) s2(n)
= 0 using bounds obtained from analytical methods. In the last presentation we showed that the ratio s2(n2) s2(n) can indeed hit every positive rational number. In this presentation, we show that the same is

Friday, July 12, 2013 — 3:30 PM EDT

## Analysis seminar

Seminar has been cancelled due to sickness.

Thursday, July 11, 2013 — 2:30 PM EDT

## Abelian Varieties learning seminar

### Robert Garbary, Pure Mathematics University of Waterloo

#### “Quotient Spaces”

Suppose we have an algebraic group G acting algebraicly on a variety X, ie for each g ∈ G the associated map X → X is a morphism. A quotient of X by G is defined to be a variety Y and a morphism π : X → Y satisfying
(1) π−1(π(x)) = Gx for all x ∈ X.
(2) For any variety Z and G-invariant morphism X → Z, there is a unique factorization through Y.

Thursday, July 11, 2013 — 1:15 PM EDT

## Analysis seminar

### Michael Ng, Department of Pure Math, University of Waterloo

#### “Dimension partition of some Cantor sets”

Tuesday, July 9, 2013 — 3:00 PM EDT

## Model Theory seminar

### Ruizhang Jin, Department of Pure Mathematics, University of Waterloo

#### “NIP Theories XVII”

We will continue on chapter 4 of the Pierre Simons notes. We will go further on mutually indiscernible sequences and start talking about DP-ranks.

Tuesday, July 9, 2013 — 1:00 PM EDT

## Geometry working seminar

### Benoit Charbonneau

#### “The geometry of Yang-Mills fields, Part 08"

Throughout the spring 2013 term, we will (as a group) be reading through and lecturing on ”The Geometry of Yang-Mills Fields” by Sir Michael Atiyah. All are welcome to attend.

Monday, July 8, 2013 — 11:30 AM EDT

## Student Number Theory seminar

### Blake Madill, Department of Pure Math, University of Waterloo

#### “The Chebotarev Density Theorem”

Thursday, July 4, 2013 — 3:30 PM EDT

## Logic seminar

### David Belanger, Cornell University

#### “Disjunctions in reverse mathematics”

Wednesday, July 3, 2013 — 2:30 PM EDT

## Algebra seminar

### Jason Bell, Department of Pure Mathematics, University of Waterloo

#### “Gromov’s theorem XII: This week it ends!”

We finally finish the proof of Gromov’s theorem.

Tuesday, July 2, 2013 — 3:00 PM EDT

## Model Theory seminar

### Eeshan Wagh and Christopher Hawthorne, Department of Pure Mathematics, University of Waterloo

#### “NIP Theories XVI”

We will continue to go through section 2.2 of Pierre Simon’s notes. We will finish discussing our characterization of invariant 1-types in O-minimal theories and then discuss products and Morley sequences in O-minimal theories.

Tuesday, July 2, 2013 — 1:00 PM EDT

## Geometry working seminar

### Saifuddin Syed & Artane Siad, Pure Mathematics Department, University of Waterloo

#### "The geometry of Yang-Mills fields, Part 07"

Throughout the spring 2013 term, we will (as a group) be reading through and lecturing on "The Geometry of Yang-Mills Fields" by Sir Michael Atiyah.

### July 2013

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