Abstract
The aim of this paper is twofold. On one hand we establish a three critical points theorem for functionals depending on a real parameter $\lambda \in \Lambda$, which is different from the one proved by B. Ricceri in [On a three critical points theorem, Arch. Math. 75 (2000), 220-226] and gives an estimate of where $\Lambda$ can be located. On the other hand, as an application of the previous result, we prove an existence theorem of three classical solutions for a two-point boundary value problem which is independent from the one by J. Henderson and H. B. Thompson [Existence of multiple solutions for second order boundary value problems, J. Differential Equations 166 (2000), 443-454]. Specifically, an example is given where the key assumption of [J. Differential Equations 166 (2000), 443-454] fails. Nevertheless, the existence of three solutions can still be deduced using our theorem.
Citation
Diego Averna. Gabriele Bonanno. "A three critical points theorem and its applications to the ordinary Dirichlet problem." Topol. Methods Nonlinear Anal. 22 (1) 93 - 103, 2003.
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