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Thursday, March 8, 2018 3:30 pm - 3:30 pm EST (GMT -05:00)

Graphs and Matroids Seminar - Peter Nelson

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.

Friday, March 9, 2018 3:30 pm - 3:30 pm EST (GMT -05:00)

Tutte Colloquium - Angèle Hamel

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 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).