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On Compactness Conditions for the $p$-Laplacian

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  • We investigate the geometry and validity of various compactness conditions (e.g. Palais-Smale condition) for the energy functional \begin{eqnarray} J_{\lambda_1}(u)=\frac{1}{p}\int_\Omega |\nabla u|^p \ \mathrm{d}x- \frac{\lambda_1}{p}\int_\Omega|u|^p \ \mathrm{d}x - \int_\Omega fu \ \mathrm{d}x \nonumber \end{eqnarray} for $u \in W^{1,p}_0(\Omega)$, $1 < p < \infty$, where $\Omega$ is a bounded domain in $\mathbb{R}^N$, $f \in L^\infty(\Omega)$ is a given function and $-\lambda_1<0$ is the first eigenvalue of the Dirichlet $p$-Laplacian $\Delta_p$ on $W_0^{1,p}(\Omega)$.
    Mathematics Subject Classification: Primary: 35J20; Secondary: 35P30, 46E35.


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    P. Takáč, On the number and structure of solutions for a Fredholm alternative with the $p$-Laplacian, J. Differ. Equ., (2002).doi: 10.1006/jdeq.2002.4173.

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