Extremal functions for Moser’s inequality
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- by Kai-Ching Lin PDF
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Abstract:
Let $\Omega$ be a bounded smooth domain in $R^{n}$, and $u(x)$ a $C^{1}$ function with compact support in $\Omega$. Moser’s inequality states that there is a constant $c_{o}$, depending only on the dimension $n$, such that \begin{equation*} \frac {1}{|\Omega |} \int _{\Omega } e^{n \omega _{n-1}^{\frac {1}{n-1}} u^{\frac {n}{n-1}}} dx \leq c_{o} , \end{equation*} where $|\Omega |$ is the Lebesgue measure of $\Omega$, and $\omega _{n-1}$ the surface area of the unit ball in $R^{n}$. We prove in this paper that there are extremal functions for this inequality. In other words, we show that the \begin{equation*} \sup \{\frac {1}{|\Omega |} \int _{\Omega } e^{n \omega _{n-1}^{\frac {1}{n-1}} u^{\frac {n}{n-1}}} dx: u \in W_{o}^{1,n}, \|\nabla u\|_{n} \leq 1 \} \end{equation*} is attained. Earlier results include Carleson-Chang (1986, $\Omega$ is a ball in any dimension) and Flucher (1992, $\Omega$ is any domain in 2-dimensions).References
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Additional Information
- Kai-Ching Lin
- Affiliation: Department of Mathematics, University of Alabama, Tuscaloosa, Alabama 35487
- Email: klin@ua1vm.ua.edu
- Received by editor(s): January 25, 1995
- Received by editor(s) in revised form: May 30, 1995
- © Copyright 1996 American Mathematical Society
- Journal: Trans. Amer. Math. Soc. 348 (1996), 2663-2671
- MSC (1991): Primary 49J10
- DOI: https://doi.org/10.1090/S0002-9947-96-01541-3
- MathSciNet review: 1333394