Seminars and Colloquia by Series

Wednesday, October 4, 2017 - 12:10 , Location: Skiles 006 , Yuri Kifer , Hebrew University of Jerusalem , Organizer: Timothy Duff
Wednesday, September 27, 2017 - 12:10 , Location: Skiles 006 , Balasz Strenner , Georgia Tech , Organizer:
Taffy pullers are machines designed to stretch taffy. They can modeled by surface homeomorphisms, therefore they can be studied by geometry and topology. I will talk about how efficiency of taffy pullers can be defined mathematically and what some of the open questions are. I will also talk about Macaw, a computer program I am working on, which does related computations and which will hopefully help answer some of the open questions.
Wednesday, September 27, 2017 - 12:10 , Location: Skiles 006 , Balazs Strenner , GA Tech , Organizer: Timothy Duff
Taffy pullers are machines designed to stretch taffy. They can modeled by surface homeomorphisms, therefore they can be studied by geometry and topology. I will talk about how efficiency of taffy pullers can be defined mathematically and what some of the open questions are. I will also talk about Macaw, a computer program I am working on, which does related computations and which will hopefully help answer some of the open questions.
Wednesday, September 20, 2017 - 12:10 , Location: Skiles 006 , Tim Duff , GA Tech , Organizer: Timothy Duff
An academic webpage allows you to better communicate your work and help you become more recognizable in your research community. We'll talk about the very basics of how to set one up and what you should put on it----no prior experience necessary! Please bring a laptop if you can---as usual, refreshments will be provided.
Wednesday, September 13, 2017 - 12:10 , Location: Skiles 006 , Howie Weiss , GA Tech , Organizer: Timothy Duff
Antibiotics have greatly reduced morbidity and mortality from infectious diseases. Although antibiotic resistance is not a new problem, it breadth now constitutes asignificant threat to human health. One strategy to help combat resistance is to find novel ways of using obsolete antibiotics.  For strains of E. coli and P. aeruginosa, pairs of antibiotics have been found where evolution of resistance to one increases, sometimes significantly, sensitivity to the other. These researchers have proposed cycling such pairs to treat infections. Similar strategies are being investigated to treat cancer. Using systems of ODEs, we model several possible treatment protocols using pairs and triples of such antibiotics, and investigate the speed of ascent of multiply resistant mutants. Rapid ascent would doom this strategy. This is joint work with Klas Udekwu (Stockholm University).
Wednesday, September 6, 2017 - 12:10 , Location: Skiles 006 , Virginia Ahalt , DoD , Organizer: Timothy Duff
SPORT is a 12-week *PAID* summer internship offered by the National Security Agency (NSA) that provides 8 U.S. Citizen graduate students the opportunity to apply their technical skills to current, real-world operations research problems at the NSA.  SPORT looks for strong students in operations research, applied math, computer science, data science, industrial and systems engineering, and other related fields. Program Highlights: -- Paid internship (12 weeks, late May to mid-August 2018) -- Applications accepted September 1 - October 31, 2017 -- Opportunity to apply operations research, mathematics, statistics, computer science, and/or engineering skills -- Real NSA mission problems -- Paid annual and sick leave, housing available, most travel costs covered -- Flexible work schedule -- Opportunity to network with other Intelligence Agencies
Wednesday, April 19, 2017 - 12:05 , Location: Skiles 006 , Lutz Warnke , Georgia Tech , Organizer: Justin Lanier
In Fall 2017 I will teach `Random Discrete Structures', which is an advanced course in discrete probability and probabilistic combinatorics. The goal of this informal lecture is to give a brief outline of the topics we intend to cover in this course. Buzz-words include Algorithmic Local Locasz Lemma, Concentration Inequalities, Differential Equation Method, Interpolation method and Advanced Second Moment Method.
Wednesday, April 12, 2017 - 12:05 , Location: Skiles 006 , Jen Hom , Georgia Tech , Organizer: Justin Lanier
Defined in the early 2000's by Ozsvath and Szabo, Heegaard Floer homology is a package of invariants for three-manifolds, as well as knots inside of them. In this talk, we will describe how work from Poul Heegaard's 1898 PhD thesis, namely the idea of a Heegaard splitting, relates to the definition of this invariant. We will also provide examples of the kinds of questions that Heegaard Floer homology can answer. These ideas will be the subject of the topics course that I am teaching in Fall 2017.
Wednesday, April 5, 2017 - 12:05 , Location: Skiles 006 , Chi Ho Yuen , Georgia Tech , Organizer: Justin Lanier
I will continue the discussion on the group actions of the graph Jacobian on the set of spanning trees. After reviewing the basic definitions, I will explain how polyhedral geometry leads to a new family of such actions. These actions can be described combinatorially, but proving that they are simply transitive uses geometry in an essential way. If time permits, I will also explain the following surprising connection: the canonical group action for a plane graph (via rotor-routing or Bernardi process) is related to the canonical tropical geometric structure of its dual graph. This is joint work with Spencer Backman and Matt Baker.
Wednesday, March 15, 2017 - 12:05 , Location: Skiles 006 , Matt Baker , Georgia Tech , Organizer: Justin Lanier
Every graph G has canonically associated to a finite abelian group called the Jacobian group.  The cardinality of this group is the number of spanning trees in G.  If G is planar, the Jacobian group admits a natural simply transitive action on the set of spanning trees.  More generally, for any graph G one can define a whole family of (non-canonical) simply transitive group actions.  The analysis of such group actions involves ideas from tropical geometry. Part of this talk is based on joint work with Yao Wang, and part is based on joint work with Spencer Backman and Chi Ho Yuen.

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