Seminars and Colloquia by Series

Series: Other Talks
Monday, April 1, 2013 - 16:30 , Location: Skiles 006 , Spencer Backman , Georgia Tech , Organizer: Anton Leykin
(algebraic statistics reading seminar)
Series: Other Talks
Monday, March 25, 2013 - 17:00 , Location: Skiles 006 , Pedro Rangel , Georgia Tech , Organizer: Anton Leykin
(algebraic statistics reading seminar)
Series: Other Talks
Wednesday, March 13, 2013 - 15:00 , Location: Skiles 005 , William Trotter , School of Mathematics, Georgia Tech , Organizer: William T. Trotter
Series: Other Talks
Monday, March 11, 2013 - 17:00 , Location: Skiles 006 , Robert Krone , Georgia Tech , Organizer: Anton Leykin
(algebraic statistics reading seminar)
Series: Other Talks
Monday, March 11, 2013 - 15:00 , Location: Marcus Nano Conf. Room 1116 , Philip Holmes , Princeton University , Organizer:

Host: Turgay Uzer, School of Physics

Annual Joseph Ford Commemorative Lecture: I will describe several models for running insects, from an energy-conserving biped, through a muscle-actuated hexapod driven by a neural central pattern generator, to a reduced phase-oscillator model that captures the dynamics of unperturbed gaits and of impulsive perturbations. I will argue that both simple models and large simulations are necessary to understand biological systems. The models show that piecewise-holonomic constraints due to intermittent foot contacts confer asymptotic stability on the feedforward system, while leg force sensors modulate motor outputs to mitigate large perturbations. Phase response curves and coupling functions help explain reflexive feedback mechanisms. The talk will draw on joint work with Einat Fuchs, Robert Full, Raffaele Ghigliazza, Raghu Kukillaya, Josh Proctor, John Schmitt, and Justin Seipel. Research supported by NSF and the J. Insley Blair Pyne Fund of Princeton University.
Series: Other Talks
Tuesday, March 5, 2013 - 16:30 , Location: Skiles 006 , Tobias Hurth , Georgia Institute of Technology, School of Mathematics , thurth3@gatech.edu , Organizer:
On a smooth manifold, we consider a non-autonomous ordinary differential equation whose right side switches between finitely many smooth vector fields at random times.  These switching times are exponentially distributed to guarantee that the resulting random dynamical system has the Markov property.  A Hoermander-type hypoellipticity condition on a recurrent subset of the manifold is then sufficient for uniqueness and absolute continuity of the invariant measure of the Markov semigroup.  The talk is based on a paper with my advisor Yuri Bakhtin.
Series: Other Talks
Monday, March 4, 2013 - 17:00 , Location: Scheller College of Business, LeCraw Auditorium , Ken Arrow , Stanford University, Emeritus , Organizer:

Hosted by the College of Computing
Light refreshments served at 4:30 PM

You are cordially invited to "Health and Wealth," a distinguished lecture by Nobel Laureate Ken Arrow that will provide a policy guide for matters of health, public and private. Professor Arrow, Joan Kenney Professor of Economics and Professor of Operations, Emeritus, at Stanford University, will address longevity and other aspects of health as commodities, as well as their trade-off with more usual goods as important measures of the well-being of nations. Register: http://www.formdesk.com/collegeofcomputing/KenArrow
Series: Other Talks
Monday, March 4, 2013 - 16:00 , Location: Skiles 006 , Charles Wang , Georgia Tech , Organizer: Anton Leykin
(algebraic statistics reading seminar; note unusual time)
Series: Other Talks
Monday, February 25, 2013 - 17:00 , Location: Skiles 006 , Pedro Rangel , Georgia Tech , Organizer: Anton Leykin
(algebraic statistics reading seminar)
Series: Other Talks
Monday, February 25, 2013 - 11:05 , Location: Skiles 005 , Gil Kalai , Hebrew University and Yale University , Organizer: Prasad Tetali
  In the lecture I will describe how several questions in geometric combinatorics translate into questions about graphs and hypergraphs.  1. Borsuk's problem.  2. Tverberg theorem and Tverberg's type problems. Tverberg's theorem asserts that (r-1)(d+1)+1 points in d-space can be divided into r parts whose convex hull intersect. I will discuss situations where less points admit such a partition and connections with graph theory. (For more background, look at this MO question Tverberg partitions with less than (r-1)(d+1)+1 points<http://mathoverflow.net/questions/88718/tverberg-partitions-with-less-than-r-1d11-points> )  3. Helly type theorems and conditions on induced subgraphs and sub-hypergraphs. I will explain the origin to the following conjecture of Meshulam and me: There is an absolute upper bound for the chromatic number of graphs with no induced cycles of length divisible by 3.  4. Embedding of 2-dimensional complexes and high dimensional minors. I will discuss the following conjecture: A 2-dimensional simplicial complex with E edges and F 2-dimensional faces that can be embedded into 4-space satisfies F < 4e. (For more background see my post *F ≤ 4E*<http://gilkalai.wordpress.com/2013/02/01/f-4e/> )

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