Cesari, Lamberto:
Teoremi di esistenza al passaggio attraverso valori critici
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Serie 8 60 (1976), fasc. n.3, p. 198-201, (Italian)
pdf (437 Kb), djvu (564 Kb). | MR 0493556 | Zbl 0364.47029
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Under sole qualitative hypotheses in the large the author has proved the existence of equibounded solutions to nonlinear operational equations in a Hilbert space when a parameter describes an interval containing a point of resonance. Applications have been made to problems of periodic solutions, and to elliptic problems.
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