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Thursday, March 6, 2014 1:30 pm - 1:30 pm EST (GMT -05:00)

Number Theory seminar

Kevin Hare, Pure Math Department, University of Waterloo

“Base d expansions with digits 0 to q 1

Let d and q be positive integers, and consider representing a positive integer n

Thursday, March 6, 2014 2:30 pm - 2:30 pm EST (GMT -05:00)

PhD thesis defence seminar

Michael Ka Shing Ng, Pure Mathematics, University of Waterloo

"Some aspects of Cantor sets"

For every positive, decreasing, summable sequence $a = (a_i)$, we can  
construct a Cantor set $C_a$ associated with $a$. These Cantor sets  
are not necessarily self-similar. Their dimensional properties and  
measures have been studied in terms of the sequence $a$.

In this thesis, we extend these results to a more general collection  

Friday, March 7, 2014 3:30 pm - 3:30 pm EST (GMT -05:00)

Analysis seminar

Heydar Radjavi, Department of Pure Mathematics, University of Waterloo

“Simultaneous Versions of Wielandt’s Positivity Theorem”

The classical Wielandt Theorem is about ”positivisation” of a matrix: If an indecomposable matrix A and and its modulus |A| have the same spectral radius, t

Wednesday, March 12, 2014 2:30 pm - 2:30 pm EDT (GMT -04:00)

Algebra seminar

Brendan Nolan, University of Kent (Canterbury)

“(Generalised) Dixmier-Moeglin Equivalence”

It is typically difficult to classify the irreducible representations of a given algebra A. A good first step is to try to find the primitive ideals i.e. the annihilators of the simple modules.

Thursday, March 13, 2014 1:30 pm - 1:30 pm EDT (GMT -04:00)

Number Theory seminar

Hector Pasten, Queen’s University

“Modular forms, ABC and effective unit equation”

In this talk I will give a brief overview of a known approach to the ABC conjecture using modular forms. Then I will explain how this approach actually gives a partial result for the ABC conjecture and Szpiro’s conjecture. As a consequence, we will obtain a new effective proof of the finiteness of solutions to the S-unit equation, which does not involve linear forms in logarithms. This is joint work with Ram Murty.

 

Friday, March 14, 2014 2:30 pm - 2:30 pm EDT (GMT -04:00)

Geometry & Topology seminar

Valentino Tosatti, Northwestern University

“Calabi-Yau theorems for non-Kahler metrics”

The celebrated Calabi-Yau theorem is an existence result for Kahler metrics with prescribed volume form (or equivalently prescribed Ricci curvature) on a compact Kahler manifold.

Friday, March 14, 2014 3:30 pm - 3:30 pm EDT (GMT -04:00)

Analysis seminar

Eberhard Kirchberg, Humboldt Universit ̈at zu Berlin

“An inner characterization of local reflexivity for C*-algebras and related open questions”

Abstract - n/a

Tuesday, March 18, 2014 4:00 pm - 4:00 pm EDT (GMT -04:00)

Pure Math colloquium

James Maynard, Oxford/Centre de Recherches Mathematiques

“Small gaps between primes”

We will introduce a refinement of the ‘GPY sieve method’ for studying small gaps between primes.

Friday, March 21, 2014 2:30 pm - 2:30 pm EDT (GMT -04:00)

Geometry & Topology seminar

Bianca Santoro, The City College of New York

“Complete Ricci-flat Kahler metrics on resolutions of singularities”

We will discuss some existence results for complete Calabi-Yau metrics on crepant resolutions of singularities, and use these results to give simple examples of ALF Ricci-flat manifolds.

Friday, March 21, 2014 3:30 pm - 3:30 pm EDT (GMT -04:00)

Analysis seminar

Roland Speicher, Universit ̈at des Saarlandes

“Free Probability Theory and Random Matrices”

I will give a concise introduction to free probability theory and random matrix theory. The main focus will be on the relation between both subjects.