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Existence for a fourth-order boundary value problem under a two-parameter nonresonance condition. (English) Zbl 0725.34020
This paper deals with the existence of solutions of the boundary value problem $$y^{\text{(IV)}}=f(x,y,y'')$$, $$0<x<1$$, $$y(0)=y_ 0$$, $$y(1)=y_ 1$$, $$y''(0)=\bar y_ 0$$, $$y''(1)=\bar y_ 1$$, where $$f: [0,1]\times {\mathbb R}^ 2\to {\mathbb R}$$ is continuous. The main theorem under a nonresonance condition involving a two-parameter linear eigenvalue problem contains a previous result of A. R. Aftabizadeh [J. Math. Anal. Appl. 116, 415–426 (1986; Zbl 0634.34009)]. This theorem also provides the uniqueness of the solution under a suitable Lipschitz-type condition, which recovers the uniqueness result due to Y. Yang in Theorem 2 of [Proc. Am. Math. Soc. 104, No. 1, 175–180 (1988; Zbl 0671.34016)]. The authors also give extensions of their results to some higher-order semilinear elliptic problems.
Reviewer: P.Pucci (Modena)

##### MSC:
 34B15 Nonlinear boundary value problems for ordinary differential equations 34B10 Nonlocal and multipoint boundary value problems for ordinary differential equations 35J50 Variational methods for elliptic systems
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