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Thursday, March 15, 2018 1:30 pm - 1:30 pm EDT (GMT -04:00)

Algebraic Graph Theory Seminar - Christopher van Bommel

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. 

Friday, March 16, 2018 3:30 pm - 3:30 pm EDT (GMT -04:00)

Tutte Colloquium - Bruce Richmond

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).

Wednesday, March 21, 2018 4:00 pm - 4:00 pm EDT (GMT -04:00)

Continuous Optimization Seminar - Ashkay Ramachandran

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

Thursday, March 22, 2018 1:30 pm - 1:30 pm EDT (GMT -04:00)

Algebraic Graph Theory Seminar - Chris Godsil

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).

Thursday, March 22, 2018 3:30 pm - 3:30 pm EDT (GMT -04:00)

Graphs and Matroids Seminar - Kazuhiro Nomoto

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.

Friday, March 23, 2018 3:30 pm - 3:30 pm EDT (GMT -04:00)

Tutte Colloquium - Padraig O Cathain

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.

Wednesday, March 28, 2018 4:00 pm - 4:00 pm EDT (GMT -04:00)

Continuous Optimization Seminar - Matthew William Slavin

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