Mathematics – Optimization and Control
Scientific paper
2011-12-20
Mathematics
Optimization and Control
7 pages, 3 figures
Scientific paper
Denoting by $\mathcal{E}\subseteq \R^2$ the set of the pairs $(\lambda_1(\Omega),\lambda_2(\Omega))$ for all the open sets $\Omega\subseteq\R^N$ with unit measure, and by $\Theta\subseteq\R^N$ the union of two disjoint balls of half measure, we give an elementary proof of the fact that $\partial\E$ has horizontal tangent at its lowest point $(\lambda_1(\Theta),\lambda_2(\Theta))$.
Brasco Lorenzo
Nitsch Carlo
Pratelli Aldo
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