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Solvability of multi-point boundary value problem at resonance. III. (English) Zbl 1054.34033
The 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 $f:[0,1]\times \Bbb R^2\to\Bbb R$, existence results are established. The main tool is the coincidence degree theory of Mawhin see, e.g., {\it 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)].

##### MSC:
 34B15 Nonlinear boundary value problems for ODE 47J05 Equations involving nonlinear operators (general) 47N20 Applications of operator theory to differential and integral equations
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##### References:
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