Wed, 28 Mar 2007
15:00
L3

Blurred exponentiation and the geometry of exponential fields

Jonathan Kirby
(UIC, Chicago)
Abstract
  I will discuss the proof that the exponential algebraic closure operator on the complex exponential field is isomorphic to the pregeometry which controls the "pseudoexponential" field.  
Wed, 28 Mar 2007
11:00
L3

From Polynomial Interpolation to the Complexity of Ideals

David Eisenbud, MSRI
(Berkeley)
Abstract

 

 

One natural question in interpolation theory is: given a finite set of points

in R^n, what is the least degree of polynomials on R^n needed to induce every

function from the points to R? It turns out that this "interpolation degree" is

closely related to a fundamental measure of complexity in algebraic geometry

called Castelnuovo-Mumford regularity. I'll explain these ideas a new

application to projections of varieties.

 

Mon, 26 Mar 2007
15:45
DH 3rd floor SR

From Ising 2D towards Mumford-Shah (joint work with Reda Messikh)

Professor Raphael Cerf
(Universite de Paris XI)
Abstract
  The talk will be self-contained and does not require specific knowledge on the Ising model. I will present the basic results concerning the Wulff crystal of the Ising model and I will study its behaviour near the critical point. Finally I will show how to apply these results to the problem of image segmentation.  
Thu, 15 Mar 2007

14:00 - 15:00
Rutherford Appleton Laboratory, nr Didcot

New developments in LAPACKJ and ScaLAPACK

Sven Hammarling
(Numerical Algorithms Group & University of Manchester)
Abstract

In this talk we shall be looking at recent and forthcoming developments in the widely used LAPACK and ScaLAPACK numerical linear algebra libraries.

Improvements include the following: Faster algorithms, better numerical methods, memory hierarchy optimizations, parallelism, and automatic performance tuning to accommodate new architectures; more accurate algorithms, and the use of extra precision; expanded functionality, including updating and downdating and new eigenproblems; putting more of LAPACK into ScaLAPACK; and improved ease of use with friendlier interfaces in multiple languages. To accomplish these goals we are also relying on better software engineering techniques and contributions from collaborators at many institutions.

After an overview, this talk will highlight new more accurate algorithms; faster algorithms, including those for pivoted Cholesky and updating of factorizations; and hybrid data formats.

This is joint work with Jim Demmel, Jack Dongarra and the LAPACK/ScaLAPACK team.

Fri, 09 Mar 2007
14:15
Dennis Sciama LT

TBA

Beatriz de Carlos
(Southampton)
Thu, 08 Mar 2007
16:30
DH Common Room

Analysis for the Nonlinear Electrolyte Wedge Problem

Joseph Fehribach
(Worcester Polytechnic Institute, USA)
Abstract

This talk will discuss recent work on 3-phase junctions (electrolyte wedges)

in porous electrodes, including nonlinear reaction kinetics. Recent work on

reaction route representations (Kirchoff graphs) will also be discussed.

Thu, 08 Mar 2007
16:15
Fisher Room of NAPL

TBA

John March-Russell
(Oxford)