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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).

##### MSC:
 34B10 Nonlocal and multipoint boundary value problems for ordinary differential equations 34B27 Green’s functions for ordinary differential equations
##### Keywords:
multipoint BVP; third-order ODE; Green function; fixed point; cone
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##### References:
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