Elizabeth Mansfield

Contact information page

A Brief CV

Breaking News

My main current project is a book for CUP, "A Practical Guide to the Invariant Calculus". I have now just about finished correcting the author's proofs. Thank you everyone for contributing the typos and other errors you found, in particular Tania Goncalves, Francis Valiquette, Evelyne Hubert, Peter Hydon and Peter Olver! Since there is no chance to correct any more errors now, I am putting here only the Table of Contents and the first ``what's in this book" chapter. The book should be available from April.

Research funding just announced: is an EPSRC grant, "Group actions on function approximation spaces", see the the epsrc webpage . I will shortly be advertising a three year post doctoral research associate position. The position is available from Sept 1, 2010 and is at Grade 7 level. A description of the project is is here.


Teaching

My office hours this term are Tuesdays and Thurdays, 11:30-12:30.

MA600/MA575 Key Skills + LaTeX timetable and MA599 Mini-Projects timetable

MA600 topics

MA552 Analysis home page

MA563 Calculus of Variations home page


Professional Activities

I am Vice Chair of ACM's SIGSAM, Special Interest Group in Symbolic and Algebraic Manipulation.

I am currently on the EPSRC Strategic Advisory Team for the mathematics program.

I am a board member for the Society for the Foundations of Computational Mathematics. I co-organised the Symbolic Analysis Workshop of three (!) FoCM conferences.

Editorial Boards

I am on the editorial advisory boards of Journal of Computation and Mathematics and Foundations of Computational Mathematics.

Research

Current Research Funding My current grant, "Symmetric variational problems", is now in its final stages. A brief description is here

Research Interests:
My research is the development of algorithms for Analysis, in the context of symbolic computation and increasingly numerical computation; recent papers are on the discrete variational calculus and moving frames. The mathematics that I use comes from commutative algebra, differential geometry, variational calculus, integrable systems and geometric integration.

I currently have three PhD students, Tania Goncalves, Richard Hoddinott, and Jun Zhao, and one MSc student, Andy Wheeler who has written his thesis now. Here is a great photo of us at the FoCM '08 banquet in Hong Kong, where Jun, Tania and Andy presented posters.

I am involved with the network grant Geometric Integration, led by Reinout Quispel and funded by the Australian Research Council. I spent 2 months study leave at the Institute of Advanced Studies at LaTrobe University working on Discrete Gradients.

Packages

diffgrob2 is a MAPLE package to simplify overdetermined systems of nonlinear differential equations of polynomial type. The algorithms are based on those by Buchberger for a Gröbner basis of a polynomial ideal. This package is no longer being maintained and is not at present available for public use. Packages which perform related functions are Maple's diffalg package maintained by Evelyne Hubert, and the Maple package rif which is available from Allan Wittkopf's home page.

The MAPLE package Indiff is now available. This is a set of functions designed to calculate reductions and compatibility conditions of systems of equations referred to a moving frame. The theory is discussed in " Algorithms for symmetric differential systems", J. Foundations of Comp. Math.,1 (2001) 335-383. The Short Manual contains installation instructions for UNIX, a guide to the procedures and three worked examples. There are two versions of the code, a readlib version and a version suitable for non-unix platforms (non readlib version). The Maple worksheets for the examples in the manual are for invariant differentation, an over determined system, and a classification problem.

Current talks

Moment maps for discrete symplectic mappings. Available from the Isaac Newton Institute website, Discrete Integrable Systems and Special Functions workshop.

Digital Atlases and Difference Forms Plenary talk at ISSAC '08, Linz.

Discrete Variational Methods Plenary talk at FoCM, Santander.

Moving Frames and Noether's Theorem.

Discrete gradients

Moving frames and invariant ODE

Moving frames and curvature flows

On a variational complex for difference systems

Towards a variational complex for finite element systems

A simple criterion for involutivity


Recent preprints

On the construction of discrete gradients with Reinout Quispel (LaTrobe). Submitted

Noether's Theorem for Smooth, Difference and Finite Element Systems , in FoCM Santander 2005. Eds: Pardo, Pinkus, Suli and Todd. CUP 2006.

A variational complex for difference equations with Peter Hydon (Surrey). Now available from Journal of Foundations of Computational Mathematics.

Towards a variational complex for the Finite Element Method with Reinout Quispel (LaTrobe). In a CRM Proceedings for the workshop on Group Theory and Numerical Analysis

Difference Forms with Peter Hydon, Journal of Foundations of Computational Mathematics.

Evolution of Curvature Invariants and Lifting Integrability, with Peter van der Kamp, Journal of Geometry and Physics

Symmetry Group Analysis of the Shallow Water and Semi-Geostrophic Equations with Nicoleta Bila and Peter Clarkson, in Quarterly Journal of Mechanics and Applied Mathematics

Thesis

Since I am still receiving requests for my PhD thesis, Differential Groebner Bases here it is! Many thanks to Katya Krupchyk for making this TeX version possible. Please note this is an historical document (submitted 1991) and appears here without amendment, with the exception that Chapter 6, which was published in its entirety (A Simple Criterion for Involutivity, Journal of the London Mathematical Society, 54, pages 323-345, 1996). Superceded computer code is also not included.


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