Forthcoming Seminars

Mon, 09/10/2006 12:00	Michael Movshev (IAS)	String Theory Seminar	L3
	Yang-Mills theory and superquadric

Mon, 09/10/2006 14:15	Tamas Hausel (Oxford and Austin, Texas)	Geometry and Analysis Seminar	L3
	Arithmetic of the Riemann-Hilbert monodromy map

Mon, 09/10/2006 14:15	Professor Gregory Miermont (Universite Paris XI)	Stochastic Analysis Seminar	DH 3rd floor SR
	Discrete fragmentation trees and their continuum asymptotics
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Mon, 09/10/2006 15:45	Professor Martin Barlow (UBC Canada)	Stochastic Analysis Seminar	DH 3rd floor SR
	Random walk on the incipient infinite cluster for oriented percolation
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Mon, 09/10/2006 15:45	Marc Lackenby (Oxford)	Topology Seminar	L3
	The crossing number of composite knots

Mon, 09/10/2006 16:00	TBA	Junior Number Theory Seminar	SR1
	To Be Announced

Mon, 09/10/2006 17:00	Jan Kristensen (Oxford)	Applied Analysis and Mechanics Seminar	L1
	The problem of regularity in the Calculus of Variations

Tue, 10/10/2006 12:00	Andre Lukas (Oxford)	Quantum Field Theory Seminar Relativity Seminar String Theory Seminar	L3
	M-theory on Calabi-Yau 5-folds

Tue, 10/10/2006 14:00	Michel van den Bergh (Hasselt)	Algebraic Geometry Seminar	L3
	Non-commutative resolutions of determinantal varieties

Tue, 10/10/2006 15:00	Louigi Addario-Berry (Oxford)	Combinatorial Theory Seminar	L3
	Ballot Theorems and Heights of Trees

Tue, 10/10/2006 15:30	Balazs Szendroi (Oxford)	Homological Mirror Symmetry Seminar	SR2
	Non-commutative Donaldson-Thomas invariants and the conifold.

Tue, 10/10/2006 17:00	Prof. C.W. Parker (University of Birmingham)	Algebra Seminar	L1
	Odd Characterisations of simple groups

Tue, 10/10/2006 17:00	Richard Haydon (Oxford)	Functional Analysis Seminar	L3
	Modifications of the Bourgain-Delbaen construction

Wed, 11/10/2006 16:00	Robin Knight (Oxford)	Analytic Topology in Mathematics and Computer Science	L3
	Categories of Scott spaces and the structure of counter-examples to Vaught Conjecture

Thu, 12/10/2006 12:00	Gil Cavalcanti (Oxford)	Junior Geometry Seminar	SR1
	Introduction to Generalized Geometry I

Thu, 12/10/2006
14:00

Prof Thomas Sonar (TU Braunschweig)

Computational Mathematics and Applications

Comlab

Strange discrete operators - A tour concerning meshless methods and image processing

One of the oldest approach in meshless methods for PDEs is the Interpolating Moving Least Squares (IMLS) technique developed in the 1980s. Although widely accepted by users working in fields as diverse as geoinformatics and crack dynamics I shall take a fresh look at this method and ask for the equivalent difference operators which are generated implicitly. As it turns out, these operators are optimal only in trivial cases and are "strange" in general. I shall try to exploit two different approaches for the computation of these operators.

On the other hand (and very different from IMLS), Total Variation Flow (TVF) PDEs are the most recent developments in image processing and have received much attention lately. Again I shall show that they are able to generate "strange" discrete operators and that they easily can behave badly although they may be properly implemented.

Thu, 12/10/2006 14:30	Kai Meng Tan (Singapore)	Representation Theory Seminar	L3
	Weight 3 blocks of symmetric groups
	http://www.maths.ox.ac.uk/arg

Thu, 12/10/2006 16:00	Alexei Skorobogatov	Number Theory Seminar	L3
	A finiteness theorem for the Bauer group of K3 surfaces

Thu, 12/10/2006 16:30	Dr. Andrew Fowler (OCIAM, Oxford)	Differential Equations and Applications Seminar	DH 1st floor SR
	Dynamical Problems in Glaciology

Fri, 13/10/2006 10:00	Xanthippi Markenscoff (University of California, San Diego)	Workshop	DH 3rd floor SR
	Self Forces on moving dislocations