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First Variations of the Best Sobolev Trace Constant with Respect to the Domain

Published online by Cambridge University Press:  20 November 2018

Julio D. Rossi*
Affiliation:
Departamento de Matemática, FCEyN UBA, (1428) Buenos Aires, Argentina e-mail: jrossi@dm.uba.ar
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Abstract

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In this paper we study the best constant of the Sobolev trace embedding ${{H}^{1}}(\Omega )\,\to \,{{L}^{2}}(\partial \Omega ),$ where $\Omega$ is a bounded smooth domain in ${{\mathbb{R}}^{N}}.$ We find a formula for the first variation of the best constant with respect to the domain. As a consequence, we prove that the ball is a critical domain when we consider deformations that preserve volume.

Type
Research Article
Copyright
Copyright © Canadian Mathematical Society 2008

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