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Symmetry and Approximate Symmetry of a Nonlinear Elliptic Problem over a Ring by Ali, Alaa Haj; Li, Dongsheng; Wang, Peiyong is a scholarly article available to read on EtoBox.

What is Symmetry and Approximate Symmetry of a Nonlinear Elliptic Problem over a Ring about?

A singularly perturbed free boundary problem arising from a real problem associated with a Radiographic Integrated Test Stand concerns a solution of the equation $\Delta u = f(u)$ in a domain $\Omega$ subject to constant boundary data, where the function $f$ in general is not monotone. When the domain $\Omega$ is a perfect ring, we incorporate a new idea of radial correction into the classical moving plane method to prove the radial symmetry of a solution. When the domain is slightly shifted from a ring, we establish the stability of the solution by showing the approximate radial symmetry of the free boundary and the solution. For this purpose, we complete the proof via an evolutionary point of view, as an elliptic comparison principle is false, nevertheless a parabolic one holds.

Author

Ali, Alaa Haj; Li, Dongsheng; Wang, Peiyong

Published

2017

Language

EN