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arXiv · 2601.16846

On the de Thélin eigenvalue problem and Landesman-Lazer conditions for quasilinear systems

David Arcoya·Natalino Borgia·Silvia Cingolani
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Abstract

In this paper we prove that the smallest eigenvalue $λ_1$ of the eigenvalue problem for a quasilinear elliptic systems introduced by de Thélin in \cite{DT}, is not only simple (in a suitable sense), but also isolated. Moreover, we characterize variationally a sequence $\{λ_k\}_k$ of eigenvalues, taking into account a suitable deformation lemma for $C^1$ submanifolds proved in \cite{BON}. Furthermore we prove the existence of a weak solution for a quasilinear elliptic systems in resonance around $λ_1$, under new sufficient Landesman-Lazer type conditions, extending the results by Arcoya and Orsina \cite{AO}.

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David Arcoya, Natalino Borgia, Silvia Cingolani. 2026-05-17. On the de Thélin eigenvalue problem and Landesman-Lazer conditions for quasilinear systems. https://arxiv.org/abs/2601.16846

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