All Seminars & Colloquia
Optimal characterization of learnability
Thursday, 4/10/2014, 9:15pm - 11:59pm
Speaker: Wesley Calvert, Southern Illinois University
Legendrian links, monotonic simplification, and Jones' conjecture on braids
Tuesday, 4/8/2014, 9:30pm - 11:59pm
Speaker: Ivan Dynnikov, University of Moscow
Border-Collision Bifurcations in A Piece-Wise Smooth Planar Dynamical System Associated with Cardiac Potential
Tuesday, 4/8/2014, 7:00pm - 11:59pm
Speaker: Irina Popovici, US Naval Academy
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.
Distinguished Speculative First of April Talk
Thursday, 4/3/2014, 9:15pm - 11:59pm
Speaker: Samuel J. Lomonaco Jr, (UMBC http://www.csee.umbc.edu/~
Previous talks in the Distinguished Speculative First of April Talk series:
I.
Speculative, Distinguished First of April Talk: Oleg Viro; Friday, April 1, 2011
Speaker: Oleg Viro (Stony Brook University)
Title: Topological, quantum and categorification invariants in 4D,
A double bubble assembly as a new phase of a ternary inhibitory system
Thursday, 4/3/2014, 8:00pm - 11:59pm
Speaker: Xiaofeng Ren, George Washington University.
Absolutely and Singular Continuous Diffraction in Aperiodic Order
Tuesday, 4/1/2014, 7:35pm - 11:59pm
Uwe Grimm, Open University, UK
Pure point diffraction is one indicator of `order' for a given
structure. Apart from periodic arrangements, such as those found in
perfect crystals, examples of pure point diffractive structures
include model sets, which are obtained by a cut and project scheme
from a higher-dimensional lattice. While continuous diffraction is
traditionally attributed to the presence of `disorder', many
aperiodically ordered systems show singular or even absolutely
continuous diffraction, while the pure point part is essentially
absent.
Aperiodic Order and Diffraction
Monday, 3/31/2014, 6:45pm - 11:59pm
Michael Baake, University of Bielefeld, Germany
The discovery of quasicrystals by Dan Shechtman in 1982
has shown that there are interesting systems beyond perfect
crystals with pure point diffraction spectra, and also that
we still have a rather limited understanding of what `order'
is supposed to mean, both mathematically and physically.
In this talk, basic structures with aperiodic order are
reviewed from the point of view of mathematical diffraction
theory, with focus on classic and paradigmatic examples.
Saturday, 3/29/2014, 5:47pm - 11:59pm
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