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On perturbations of a translationally-invariant differential equation

Published online by Cambridge University Press:  14 November 2011

R.J. Magnus
R.J. Magnus
Affiliation:
Science Institute, University of Iceland, Dunhaga 3, 107 Reykjavik, Iceland
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Synopsis

We study certain perturbations of the differential equation Δu − u + up = 0 on all of n-dimensional Euclidean space. Conditions are obtained which ensure the existence of a solution to the perturbed equation near a given solution to the unperturbed equation. We have to overcome degeneracy of the unperturbed solution and lack of smooth dependence on the perturbation parameter. An abstract version of the argument is sketched in a functional-analytic setting related toequivariant bifurcation theory. We consider also a smooth perturbation with several parameters and study the singularities of the mapping which maps each solution to its associated parameters.

Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh Section A: Mathematics , Volume 110 , Issue 1-2 , 1988 , pp. 1 - 25
Copyright
Copyright © Royal Society of Edinburgh 1988

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