Extremal points of a functional on the set of convex functions
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- by T. Lachand-Robert and M. A. Peletier PDF
- Proc. Amer. Math. Soc. 127 (1999), 1723-1727 Request permission
Abstract:
We investigate the extremal points of a functional $\int f(\nabla u)$, for a convex or concave function $f$. The admissible functions $u:\Omega \subset \mathbf {R}^N\to \mathbf {R}$ are convex themselves and satisfy a condition $u_2\leq u \leq u_1$. We show that the extremal points are exactly $u_1$ and $u_2$ if these functions are convex and coincide on the boundary $\partial \Omega$. No explicit regularity condition is imposed on $f$, $u_1$, or $u_2$. Subsequently we discuss a number of extensions, such as the case when $u_1$ or $u_2$ are non-convex or do not coincide on the boundary, when the function $f$ also depends on $u$, etc.References
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Additional Information
- T. Lachand-Robert
- Affiliation: Université Pierre et Marie Curie, Laboratoire d’Analyse Numérique, 75252 Paris Cedex 05, France
- Email: lachand@ann.jussieu.fr
- M. A. Peletier
- Affiliation: University of Bath, Claverton Down, Bath BA2 7AY United Kingdom
- Email: M.A.Peletier@bath.ac.uk
- Received by editor(s): September 10, 1997
- Published electronically: February 11, 1999
- Additional Notes: Part of this work was carried out during a visit of the second author to Université Pierre et Marie Curie under the contract of the European Union 921 CHRX CT 94.
- Communicated by: Jeffrey B. Rauch
- © Copyright 1999 American Mathematical Society
- Journal: Proc. Amer. Math. Soc. 127 (1999), 1723-1727
- MSC (1991): Primary 49K99
- DOI: https://doi.org/10.1090/S0002-9939-99-05209-0
- MathSciNet review: 1646197