All Seminars & Colloquia
Tuesday, 3/4/2014, 9:00pm - 11:59pm
Location: Seminar Room (Monroe Hall 267)
Abstract: In this talk I will give an overview of computability theory. I will discuss the basic concepts and ideas of the field, the types of things we study, and give some fun examples of "computable" and "noncomputable" objects. This talk should be accessible to all math graduate students.
Computable categoricity of computable partial injection structures
Thursday, 2/27/2014, 10:15pm - 11:59pm
Speaker: Leah Marshall, GWU
Border-Collision Bifurcations in A Piece-Wise Smooth Planar Dynamical System Associated with Cardiac Potential
Tuesday, 2/25/2014, 8:00pm - 11:59pm
Speaker: Irina Popovici, US Naval Academy
Time:Tuesday, February 25, 3:00 PM
Abstract: The talk addresses the bifurcations of a two-dimensional non-linear dynamical system introduced by Kline and Baker to model cardiac rhythmic response to periodic stimulation. The dynamical behavior of this continuous (but only piece-wise smooth) model transitions from simple (a unique attracting cycle) to complicated (co-existence of stable cycles) as the stimulus period is decreased from large towards zero.
Border-Collision Bifurcations in A Piece-Wise Smooth Planar Dynamical System Associated with Cardiac Potential
Tuesday, 2/25/2014, 8:00pm - 11:59pm
Speaker: Irina Popovici, US Naval Academy
Time:Tuesday, February 25, 3:00 PM
Abstract: The talk addresses the bifurcations of a two-dimensional non-linear dynamical system introduced by Kline and Baker to model cardiac rhythmic response to periodic stimulation. The dynamical behavior of this continuous (but only piece-wise smooth) model transitions from simple (a unique attracting cycle) to complicated (co-existence of stable cycles) as the stimulus period is decreased from large towards zero.
Introduction to twist spinning of knots; II
Tuesday, 2/25/2014, 6:00pm - 11:59pm
Speaker: Seung Yeop Yang (GWU)
A Liouville-type theorem for higher order elliptic systems
Friday, 2/21/2014, 9:00pm - 11:59pm
Speaker: Mingfeng Zhao, University of Connecticut.
Abstract: By using a Rellich-Pohozaev identity and an adapted Souplet's idea about the measure and feedback arguments, we prove that there are no positive solutions to higher order Lane-Emden system provided some conditions. Our result is a higher order analogue of Souplet's result for Lane-Emden system. This is a joint work with Frank Arthur and Xiaodong Yan.
Topological Mixing Tilings of $\mathbb{R}^2$ Generated by a Generalized Substitution
Friday, 2/21/2014, 8:00pm - 11:59pm
Speaker: Tyler White, Northern Virginia Community College
Abstract: Kenyon, in his 1996 paper, gave a class of examples of tilings of \mathbb{R}^2 constructed from generalized substitutions. These examples are topologically conjugate to self-similar tilings of the plane (with fractal boundaries). I have proven that an infinite sub-family of Kenyon's examples are topologically mixing. These are the first known examples of topologically mixing substitution tiling dynamical systems of \mathbb{R^2}.
Colloquia joint with AMW Chapter of GWU
Stability of Soliton Solutions to the Korteweg-deVries Equation
Friday, 2/21/2014, 6:00pm - 11:59pm