29.11.2012 to 30.11.2012

Grant Lythe

University of Leeds

Grant Lythe

27.11.2012

Daniel Peterseim

Bonn University

Title: A New Multiscale Method for (Semi-)Linear Elliptic Problems

Abstract: This talk summarizes some recent results on (semi-)linear elliptic multiscale problems with rough coefficients.  I will propose and analyze a new Multiscale Method which is based on a generalized finite element basis that spans a low dimensional macroscopic approximation space based on some coarse mesh.  The basis is assembled by performing parallel localized microscopic computations in small patches that have a diameter of order H log(1/H) where H is the coarse mesh size.  The energy (resp. L2) error of the method converges linearly (resp. quadratically) with respect to the coarse mesh size without any pre-asymptotic effects.  As further applications of this theory, I will comment on eigenvalue problems and the fast iterative solution of the corresponding linear systems of algebraic equations.

14.11.2012

Martin Gander

University of Geneva

Martin Gander

‘On the Origins of Domain Decomposition Methods’

07.11.2012

Chris Farmer

Mathematical Institute, University of Oxford

Chris Farmer

‘A variational smoothing filter for sequential inverse problems’

This visit was in conjunction with the ERGO and ACM seminar series

26.10.2012

Ralf Kornhuber

Freie Universität Berlin

Ralf Kornhuber,

‘Heterogeneous domain decomposition methods for ground and surface water flow’

17.09.2012

Tammy Kolda

Sandia National Laboratories, California

Tammy Kolda

‘Capturing Community Behavior in Very Large Networks’

16.07.2012

Michael L Overton

Courant Institute, New York University.

Michael L. Overton

‘NONSMOOTH, NONCONVEX OPTIMIZATION’

This visit was joint with the ERGO seminar series

06.06.2012

Robert van de Geijn

University of Texas in Austin

Robert van de Geijn, University of Texas in Austin

"Design by Transformation - Application to Dense Linear Algebra Libraries"

23.05.2012 to 28.05.2012

Yurii Nesterov

Universite catholique de Louvain

Yurii Nesterov

22.05.2012 to 25.05.2012

Nathan Srebro

University of Chicago

Nathan Srebro

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