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Multiple positive solutions for a three-point boundary value problem. (English) Zbl 0906.34014
The author deals with the three-point boundary value problem \[ -x'''+ f(x(t))= 0,\quad x(0)= x'(t_2)= x''(1)= 0\tag{1} \] with \(t_2\in\left[{1\over 2},1\right)\), \(f: \mathbb{R}\to \mathbb{R}\) is continuous and nonnegative for \(x\geq 0\).
Using properties of the Green function of the corresponding linear problem and a theorem by R. W. Leggett and L. R. Williams [Indiana Univ. Math. J. 28, 673-688 (1979; Zbl 0421.47033)], the author proves the existence of at least three positive solutions to (1).

34B10 Nonlocal and multipoint boundary value problems for ordinary differential equations
34B27 Green’s functions for ordinary differential equations
Full Text: DOI
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