Solvability of multi-point boundary value problem at resonance. III.

*(English)*Zbl 1054.34033The nonlinear second-order ordinary differential equation
\[
x''=f(t, x(t), x'(t)) + e(t)\,, \quad t\in (0,1),
\]
subject multipoint boundary conditions of four types is considered. The purpose of the paper is to study the resonant cases. Under certain growth conditions on the continuous nonlinear function \(f:[0,1]\times \mathbb R^2\to\mathbb R\), existence results are established. The main tool is the coincidence degree theory of Mawhin see, e.g., J. Mawhin [Topological degree and boundary value problems for nonlinear differential equations. Berlin: Springer-Verlag. Lect. Notes Math. 1537, 74–142 (1993; Zbl 0798.34025)].

For Parts I and II, see [Indian J. Pure Appl. Math. 33, No. 4, 475–494 (2002; Zbl 1021.34013), Appl. Math. Comput. 136, No. 2-3, 353–377 (2003; Zbl 1053.34016)].

For Parts I and II, see [Indian J. Pure Appl. Math. 33, No. 4, 475–494 (2002; Zbl 1021.34013), Appl. Math. Comput. 136, No. 2-3, 353–377 (2003; Zbl 1053.34016)].

Reviewer: Petr Girg (Plžen)

##### MSC:

34B15 | Nonlinear boundary value problems for ordinary differential equations |

47J05 | Equations involving nonlinear operators (general) |

47N20 | Applications of operator theory to differential and integral equations |

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\textit{B. Liu} and \textit{J. Yu}, Appl. Math. Comput. 129, No. 1, 119--143 (2002; Zbl 1054.34033)

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