All Seminars & Colloquia
Orderings of algebraic structures on trees
Jennifer Chubb, University of San Francisco
Thursday, 9/19/2013, 9:30pm - 11:59pm
Abstract: A partial left ordering or bi-ordering of an algebraic structure is a partial ordering of the elements of the structure, which is invariant under the structure acting on itself on the left or, respectively, both on the left and on the right. I will discuss algorithmic properties of the orderings admitted by a computable structure, and consider some general questions
Quandles and codimension two embeddings
Jozef Przytycki, GWU
Thursday, 9/5/2013, 9:30pm - 11:59pm
Abstract: Distributivity has been an integral part of logic for a long time. An attempt to decouple them in linear logic applied to quantum mechanics was not successful. Distributivity in topology is a more recent development and can be dated to the PhD dissertation of Joyce in 1979, in which quandles were applied to knot theory. The next push came with construction of homology theory for quandles by Fenn, Rourke, and Sanderson (between 1990 and 1995). In 1998, Carter, Kamada, and Saito
Kato Estimates for NLS, L^2 and H^1 solutions
Analysis Seminar by Joe Jerome, Northwestern
Tuesday, 5/28/2013, 5:00pm - 11:59pm
Local and global existence in nonlinear Schrodinge qequation.
Analysis Seminar by Joe Jerome, Northwestern
Wednesday, 5/15/2013, 5:56pm - 11:59pm
Expotenntial bases and frameson 2-dimensional trapezoids.
Analysis Seminar by Anudeep Kumar (Grad stdent GWU)
Sunday, 4/28/2013, 5:57pm - 11:59pm
Analysis Seminar by Yen Do (Yale)
Thursday, 2/28/2013, 7:00pm - 11:59pm
Title: Quantitative convergence of Fourier series in weighted settings. Abstract: In this talk I will describe a recent joint result with Michael Lacey, where we obtain more quantitative information about convergence of Fourier series in weighted settings
Representations of Quantum Channels
Tanner Crowder, NRL/Howard U.
Wednesday, 2/20/2013, 5:00pm - 11:59pm
Abstract: Every qubit channel can be realized as an affine map on the unit ball; the map is called the Bloch representation of the qubit channel. This representation has proven extremely useful in calculating information theoretic quantities associated with the channel. We consider the Bloch representation for n-qubit systems and discuss the applications and challenges with the higher dimensional extension. We will conclude with some open problems in quantum information.
Quantum Computation and Quantum Simulation Experiments with Trapped Ions
Crystal Senko, Joint Quantum Institute, University of Maryland
Sunday, 12/9/2012, 7:00pm - 11:59pm
Abstract: The experimental implementation of a large-scale quantum computer remains a major outstanding challenge. Several physical systems have been demonstrated to have the excellent isolation from environmental noise and the precise external control needed to perform quantum computations, and some of the most advanced results have been achieved using trapped atomic ions. I will give an overview of how trapped ions are used for quantum information processing and briefly discuss the current state of trapped ion quantum computing experiments.
Signal processing with the Euler calculus
Michael Robinson, Department of Mathematics and Statistics, American University
Wednesday, 11/14/2012, 6:00pm - 11:59pm
Abstract: It happens that many of the transforms traditionally used in signal processing have natural analogs under the Euler integral, popularized by Baryshnikov and Ghrist. The properties of these transforms are sensitive to topological (as well as certain geometric) features in the sensor field and allow signal processing to be performed on structured, integer valued data, such as might be gathered from ad hoc networks of inexpensive sensors. For instance, the analog of the Fourier transform computes a measure of width of support for indicator functions.
Optimal regularity estimates for non linear continuity equations
Analysis Seminar by Pierre Emmanuel Jabin (UMD)
Saturday, 11/3/2012, 3:00am - Thursday, 1/30/2014, 11:59pm
Abstract: We prove compactness and hence existence for solutions to a class of non linear transport equations. The corresponding models combine the features of linear transport equations and scalar conservation laws. We introduce a new method which gives quantitative compactness estimates compatible with both frameworks.