We consider the minimization problem min⁡Ω∈X(Λ2−Λ∞)(Ω),\begin{aligned}\min_{\Omega\in X}\left(\Lambda_2-\Lambda_\infty\right)(\Omega),\end{aligned} where Λ2(Ω)\Lambda_2(\Omega) and Λ∞(Ω)\Lambda_\infty(\Omega) are the (square root of the) first eigenvalue of the Laplacian and the first eigenvalue of the ∞−\infty-Laplacian respectively. XX is the class of convex domains with prescribed diameter. We prove existence of a solution, and we provide several geometrical properties of minimizers

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Marino Belloni

Dip. di Matematica, Università di Parma, Viale G. P. Usberti 53/A, 43100 Parma, Italy

marino.belloni@unipr.it

Edouard Oudet

Laboratoire de Mathematiques, Université de Savoie, Campus Scientifique, 73376 Le-Bourget-du-Lac, France

edouard.oudet@univ-savoie.fr
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M. Belloni, E. Oudet. “The Minimal Gap Between Λ_2(Ω) and Λ_∞(Ω) in a Class of Convex Domains.” Journal of Convex Analysis 15 (2008), No. 3, 507–521. https://doi.org/10.68381/jca15036