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Periodic solutions for a kind of Rayleigh equation with a deviating argument. (English) Zbl 1073.34081
The present paper is concerned with the existence of periodic solutions for the following Rayleigh delay equation $x''(t)+f(x'(t)) +g(x(t-\tau (t))) =p(t)$ by Mawhin’s coincidence degree theory. Sufficient conditions are given. An example is provided.

##### MSC:
 34K13 Periodic solutions to functional-differential equations
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##### References:
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