Three-point boundary value problems with solutions that change sign. (English) Zbl 1055.34023

Infante, G.; Webb, J. R. L.

J. Integral Equations Appl. 15, No. 1, 37-57 (2003).

The authors study the existence of nonzero solutions of the second-order differential equation \[ u^{''}(t)+g(t)f(u(t))=0, \;\;0<t<1,\eqno{(1)} \] under one of the boundary conditions \[ u^{'}(0)=0,\;\alpha u(\eta)=u(1),\;\;0<\eta<1,\eqno{(2)} \]
\[ u(0)=0,\;\alpha u(\eta)=u(1),\;\;0<\eta<1.\eqno{(3)} \] By using the theory of fixed-point index, results on the existence of at least one or of multiple nonzero solutions for BVP (1), (2), and BVP (1), (3), are obtained.

Reviewer: Wei Nian Li (Shanghai)

MSC:

34B10	Nonlocal and multipoint boundary value problems for ordinary differential equations
34B18	Positive solutions to nonlinear boundary value problems for ordinary differential equations
47H10	Fixed-point theorems
47H30	Particular nonlinear operators (superposition, Hammerstein, Nemytskiĭ, Uryson, etc.)

Keywords:

fixed-point index; cone; nonzero solution

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