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Thursday, March 29, 2018 — 3:30 PM EDT

Title: Knots and their (embedded) graphs

Speaker: Iain Moffatt
Affiliation: Royal Holloway University of London
Room:  MC 5479

Abstract

There is a classical and well-known way to describe an alternating knot or link as a plane graph, known as its Tait graph.

Wednesday, March 28, 2018 — 4:00 PM EDT

Title: Tractable Approximations to Robust Conic Optimization Problems (paper by D. Bertsimas, M. Sim)

Speaker: Matthew William Slavin
Affiliation: University of Waterloo
Room: MC 5479

Abstract: We review the paper listed in the title of this talk. In the paper, Bertsimas and Sim propose a relaxed robust counterpart for general conic optimization problems

Tuesday, March 27, 2018 — 4:00 PM EDT

Title: Implementing cryptography at scale 

Speaker: Edward Knapp
Affiliation: Google
Room: MC 5501

Abstract: Many cryptographic primitives have rough edges which make them difficult to use properly (by both experts and non-experts).

Monday, March 26, 2018 — 1:00 PM EDT

Title: LWE Part 2: A quantum discrete Gaussian sampler.

Speaker: Luis Ruiz
Affiliation: University of Waterloo
Room: MC 6486

Abstract: In this talk we will describe how a (quantum) Gaussian sampler could be constructed if we had access to a solver of a decoding problem.

Friday, March 23, 2018 — 3:30 PM EDT

Title: Morphisms of complex Hadamard matrices

Speaker: Padraig O Cathain
Affiliation: Worcester Polytechnic University
Room: MC 5501

Abstract:

Let M be a matrix with complex entries of unit norm. A well-known theorem of Hadamard bounds the magnitude of the determinant of M as a function of its dimension, and M is a complex Hadamard matrix if M meets Hadamard's bound with equality.

Thursday, March 22, 2018 — 3:30 PM EDT

Title: Excluding claws in binary matroids

Speaker: Kazuhiro Nomoto
Affiliation: University of Waterloo
Room: MC 5479

Abstract: A simple binary matroid is claw-free if no rank-3 flats are independent. We discuss an exact structure theorem for such matroids and sketch its proof. This is joint work with Peter Nelson.

Thursday, March 22, 2018 — 1:30 PM EDT

Title: Unitary groups over finite fields

Speaker: Chris Godsil
Affiliation: University of Waterloo
Room: MC 6486

Abstract: I will discuss the unitary groups over finite fields, and the structures on which they act (these include 2-designs and generalized quadrangles).

Wednesday, March 21, 2018 — 4:00 PM EDT

Title: D. Bertsimas, I. Popescu - Optimal inequalities in probability theory: A convex optimization approach

Speaker: Ashkay Ramachandran
Affiliation: University of Waterloo
Room: MC 5479

Abstract: Abstract. We propose a semidefinite optimization approach to the problem of deriving tight moment

Friday, March 16, 2018 — 3:30 PM EDT

Title: A George Szekeres formula for restricted partitions

Speaker: Bruce Richmond
Affiliation: University of Waterloo
Room: MC 5501

Abstract:

We give asymptotic formulas for the number of integer partitions of n with at most j parts and having largest part at most r, say A(n,j,r). We do this also for the number of partitions of n with largest part equal to  r and having exactly j parts, say C(n,j,r).

Thursday, March 15, 2018 — 1:30 PM EDT

Title: Quantum State Transfer

Speaker: Christopher van Bommel
Affilliation: University of Waterloo
Room: MC 6486

Abstract:

Many quantum algorithms may be modeled as a quantum process occurring on a graph.  We interpret quantum channels implemented by spin chains as wires for transmission of states. 

Wednesday, March 14, 2018 — 4:00 PM EDT

Title: Data-driven Inverse Optimization with Imperfect Information

Speaker: Stefan Sremac
Affilliation: University of Waterloo
Room: MC 5479

Abstract:

We continue our reading group with a paper by Kuhn et al with the same title as above.

Tuesday, March 13, 2018 — 4:30 PM EDT

Title: What's an amplituhedron?

Speaker: Cameron Marcott
Affilliation: University of Waterloo
Room: MC 5501

Abstract

I'll introduce the amplituhedron, focusing on why the suffix "hedron" is justified.

Monday, March 12, 2018 — 1:30 PM EDT

Title: LWE Part 1: The problem, the cryptosystem and its relationship to lattice Problems

Speaker: Luiz Ruiz
Affiliation: University of Waterloo
Room: MC 6486

Abstract:

In this talk we will give an overview of the Learning With Errors problem,

Friday, March 9, 2018 — 3:30 PM EST

Title: Chromatic Symmetric Functions and H-Free Graphs

Speaker: Angèle Hamel 
Affiliation: Wilfrid Laurier University
Room: MC 2038 (not 5501)

Abstract:

Chromatic symmetric functions are defined in terms of colourings of particular graphs. Some key conjectures in this area concern whether chromatic symmetric functions of claw-free graphs can be written in terms of other symmetric functions with positive coefficients.

Thursday, March 8, 2018 — 3:30 PM EST

Title: Claws, ω and χ: induced binary submatroids

Speaker: Peter Nelson
Affilliation: University of Waterloo
Room: MC 5479

Abstract:

I will discuss the interplay between clique number, chromatic number, and excluding induced submatroids in the setting of binary matroids.

Thursday, March 8, 2018 — 1:30 PM EST

Title: Unitary Groups, II

Speaker: Chris Godsil
Affiliation: University of Waterloo
Room: MC 6486

Abstract:

Actually the title should be 2 Unitary groups - I will discuss the 2-dimensional unitary groups.

Monday, March 5, 2018 — 3:30 PM EST

Title: Traveling Salesman Problems

Speaker: William (Bill) Cook
Affiliation: University of Waterloo
Room: MC 5417

Abstract:

We discuss open research questions, both theoretical and computational, surrounding the traveling salesman problem.

Thursday, March 1, 2018 — 3:30 PM EST

Title: Counting matroids

Speaker: Jorn van der Pol
Affiliation: University of Waterloo
Room: MC 5479

Abstract:

We discuss several recent results concerning matroid enumeration and typical properties of matroids, emphasizing the central role that sparse paving matroids play in these results.

Thursday, March 1, 2018 — 1:30 PM EST

Title: Unitary Groups

Speaker: Chris Godsil
Affiliation:  University of Waterloo
Room: MC 6486

Abstract:

Unitary groups play an important role in physics and in finite geometry. This talk, the first of two, will provide an introduction to the topic focusing on the case where the underlying field is the complex numbers.

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