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Oscillation theorems of nth-order functional differential equations with forcing terms. (English) Zbl 0587.34029
This paper is concerned with the functional differential equations of the form (1) $$x^{(n)}(t)+p(t)x(g(t))=f(t),$$ (2) $$x^{(n)}(t)+q(t)x(h(t))=r(t),$$ and (3) $$x^{(n)}(t)+p(t)x(g(t))+q(t)x(h(t))=f(t).$$ Assuming that some strong conditions hold true, the authors prove that every solution x(t) of (1), (2) and (3) is either oscillatory or else it satisfies: $$\lim_{t\to \infty}x^{(i)}(t)=0$$, (0$$\leq i\leq n-1)$$.
Reviewer: T.Ding

##### MSC:
 34C15 Nonlinear oscillations and coupled oscillators for ordinary differential equations
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##### References:
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