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arXiv · 2610.36457

A self-contained proof of the variational characterization of the principal eigenvalue of $-Δ+q$ under general Robin boundary conditions of non-classical type

Julián López-Gómez·Alejandro Sahuquillo
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Abstract

In this paper, we are going to deliver a completely self-contained proof of the variational characterization of the principal eigenvalue of $-Δ+q$ in $Ω$ under Robin boundary conditions of non-classical type, $\frac{\partial u}{\partial n}+β(x)u=0$ on $\partialΩ$, where $β(x)$ is allowed to change sign on $\partialΩ$. The classical case occurs in the very special case when $β\geq 0$ on $\partialΩ$.

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Julián López-Gómez, Alejandro Sahuquillo. 2026-10-27. A self-contained proof of the variational characterization of the principal eigenvalue of $-Δ+q$ under general Robin boundary conditions of non-classical type. https://arxiv.org/abs/2610.36457

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