McKenna, P.J.:
Existence of Solutions Across Resonance in the Large for Semilinear Problems
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Serie 8 65 (1978), fasc. n.6, p. 247-251, (English)
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Sunto
L’Autore considera l’equazione astratta: \begin{equation} \label{1} Ex + \lambda x = Nx \end{equation} con $E$ operatore lineare, $N$ operatore non lineare, $\lambda$ parametro. Detti $\lambda_{0}$ e $\lambda_{1}$ due successivi autovalori di (1) (con $N=0$), e sotto opportune condizioni per $N$, dimostra che esiste un $\epsilon >0$, tale che per $\lambda_{0} — \epsilon < \lambda < \lambda_{1}$ la (1) ammette un insieme di soluzioni uniformemente limitate.
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