Graef, John R. and Spikes, Paul W.:
Nonoscillation theorems for forced second order non linear differential equations
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Serie 8 59 (1975), fasc. n.6, p. 694-701, (English)
pdf (658 Kb), djvu (985 Kb). | MR 0486797 | Zbl 0415.34033
Sunto
Gli Autori provano alcuni nuovi criteri sufficienti, indipendenti da altri criteri da loro ottenuti in precedenza, perché gli integrali dell'equazione $(a(t) x^{\prime})^{\prime} + q(t) f(x) g(x^{\prime}) = r(t)$ siano tutti non oscillatori.
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