## University COVID-19 update

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Please note: The University of Waterloo is closed for all events until further notice.

# Events - January 2019

Thursday, January 31, 2019 — 1:30 PM EST

## Algebraic Graph Theory Seminar- Sabrina Lato

Title: Quantum Walks on Oriented Graphs

 Speaker: Sabrina Lato Affiliation: University of Waterloo Room: MC 6486

Abstract: A quantum walk on a graph is defined based on a Hermitian matrix associated with the graph, such as the adjacency matrix.

Wednesday, January 30, 2019 — 3:30 PM EST

## Graphs and Matroids- Tom Kelly

Title: Fractional coloring with local demands

 Speaker: Tom Kelly Affiliation: University of Waterloo Room: MC 6486

Abstract: In a fractional coloring, vertices of a graph are assigned subsets of the $[0, 1]$-interval such that adjacent vertices receive disjoint subsets.

Tuesday, January 29, 2019 — 2:00 PM EST

## Reading Group on Entropy and Counting- Michelle Delcourt

Title: Applications of the entropy method

 Speaker: Michelle Delcourt Affiliation: University of Waterloo Room: MC 6486

Abstract: In the second talk of our reading group on entropy and counting.

Friday, January 25, 2019 — 3:30 PM EST

## Tutte Colloquium - Mehdi Karimi

Title: Convex Optimization Problems in Domain-Driven Form

 Speaker: Mehdi Karimi Affiliation: University of Waterloo Room: MC 5501

Abstract:

In this talk, we introduce the Domain-Driven form for convex optimization problems and show how general it is by several examples; including LP, SDP, geometric and entropy programming, and quantum entropy optimization.

Friday, January 25, 2019 — 1:00 PM EST

## CompOpt Reading Group- Justin Toth

Title: Additive Approximation of Chromatic Number in Apex-minor-free Graphs

 Speaker: Justin Toth Affiliation: University of Waterloo Room: MC 5479

Abstract: In this talk we will see a t+3 additive approximation to the chromatic number for t-apex-minor-free

Wednesday, January 23, 2019 — 3:30 PM EST

## Graphs and Matroids Seminar- Bill Kay

Title: Induced Poset Saturation

 Speaker: Bill Kay Affilliation: Ryerson University Room: MC 6486

Abstract: In Graph Theory, we say that a graph G is H saturated if G contains no copy of H as a subgraph,

Tuesday, January 22, 2019 — 2:00 PM EST

## Reading Group - Graph Theory

Title: Announcing new Reading Group this term on the topic of "Entropy and Counting"

 Speaker: Various/TBD Affiliation: University of Waterloo Room: MC 6486

Abstract:

A new Reading Group will be starting this term on the topic of "Entropy and Counting". The talks will take place weekly on Tuesdays from 2:00 p.m. to 3:00 p.m. in MC 6486 starting on Jan 22th.

Tuesday, January 22, 2019 — 2:00 PM EST

## Reading Group on Entropy and Counting- Richard Lang

Title: Introduction to Entropy and Counting

 Speaker: Richard Lang Affiliation: University of Waterloo Room: MC 6486

Abstract: In the first talk of our reading group, we introduce the notion of entropy and derive some of its basic properties.

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