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Title: Unitary Groups
Speaker: Chris Godsil Affiliation: University of Waterloo Room: MC 6486Abstract:
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.
Title: Counting matroids
Speaker: Jorn van der Pol Affiliation: University of Waterloo Room: MC 5479Abstract:
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.
Title: Traveling Salesman Problems
Speaker: William (Bill) Cook Affiliation: University of Waterloo Room: MC 5417Abstract:
We discuss open research questions, both theoretical and computational, surrounding the traveling salesman problem.
Title: Unitary Groups, II
Speaker: Chris Godsil Affiliation: University of Waterloo Room: MC 6486Abstract:
Actually the title should be 2 Unitary groups  I will discuss the 2dimensional unitary groups.
Title: Claws, ω and χ: induced binary submatroids
Speaker: Peter Nelson Affilliation: University of Waterloo Room: MC 5479Abstract:
I will discuss the interplay between clique number, chromatic number, and excluding induced submatroids in the setting of binary matroids.
Title: Chromatic Symmetric Functions and HFree 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 clawfree graphs can be written in terms of other symmetric functions with positive coefficients.
Title: LWE Part 1: The problem, the cryptosystem and its relationship to lattice Problems
Speaker: Luiz Ruiz Affiliation: University of Waterloo Room: MC 6486Abstract:
In this talk we will give an overview of the Learning With Errors problem,
Title: What's an amplituhedron?
Speaker: Cameron Marcott Affilliation: University of Waterloo Room: MC 5501Abstract:
I'll introduce the amplituhedron, focusing on why the suffix "hedron" is justified.
Title: Datadriven Inverse Optimization with Imperfect Information
Speaker: Stefan Sremac Affilliation: University of Waterloo Room: MC 5479Abstract:
We continue our reading group with a paper by Kuhn et al with the same title as above.
Title: Quantum State Transfer
Speaker: Christopher van Bommel Affilliation: University of Waterloo Room: MC 6486Abstract:
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.
Title: A George Szekeres formula for restricted partitions
Speaker: Bruce Richmond Affiliation: University of Waterloo Room: MC 5501Abstract:
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).
Title: D. Bertsimas, I. Popescu  Optimal inequalities in probability theory: A convex optimization approach
Speaker: Ashkay Ramachandran Affiliation: University of Waterloo Room: MC 5479Abstract: Abstract. We propose a semidefinite optimization approach to the problem of deriving tight moment
Title: Unitary groups over finite fields
Speaker: Chris Godsil Affiliation: University of Waterloo Room: MC 6486Abstract: I will discuss the unitary groups over finite fields, and the structures on which they act (these include 2designs and generalized quadrangles).
Title: Excluding claws in binary matroids
Speaker: Kazuhiro Nomoto Affiliation: University of Waterloo Room: MC 5479Abstract: A simple binary matroid is clawfree if no rank3 flats are independent. We discuss an exact structure theorem for such matroids and sketch its proof. This is joint work with Peter Nelson.
Title: Morphisms of complex Hadamard matrices
Speaker: Padraig O Cathain Affiliation: Worcester Polytechnic University Room: MC 5501Abstract:
Let M be a matrix with complex entries of unit norm. A wellknown 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.
Title: LWE Part 2: A quantum discrete Gaussian sampler.
Speaker: Luis Ruiz Affiliation: University of Waterloo Room: MC 6486Abstract: 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.
Title: Implementing cryptography at scale
Speaker: Edward Knapp Affiliation: Google Room: MC 5501Abstract: Many cryptographic primitives have rough edges which make them difficult to use properly (by both experts and nonexperts).
Title: Tractable Approximations to Robust Conic Optimization Problems (paper by D. Bertsimas, M. Sim)
Speaker: Matthew William Slavin Affiliation: University of Waterloo Room: MC 5479Abstract: 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
Title: Knots and their (embedded) graphs
Speaker: Iain Moffatt Affiliation: Royal Holloway University of London Room: MC 5479Abstract:
There is a classical and wellknown way to describe an alternating knot or link as a plane graph, known as its Tait graph.
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