Abstract

Employing the coincidence degree theory of Mawhin we obtain some existence results of periodic solutions for a type of neutral Rayleigh equation with variable parameter $$((x(t) - c(t)x(t - \tau))'' + f(x'(t)) + g(x(t - \gamma(t))) = e(t).$$ It is worth noting that c(t) is no longer a constant which is different from the corresponding ones of past work. Furthermore, our results generalize corresponding work in the past.

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