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Keywords:
nonlinear functional differential equation; differential equation with deviating arguments; periodic solutions; coincidence degree theory
nonlinear functional differential equation; differential equation with deviating arguments; periodic solutions; coincidence degree theory
Summary:
This paper is concerned with periodic solutions of first-order nonlinear functional differential equations with deviating arguments. Some new sufficient conditions for the existence of periodic solutions are obtained. The paper extends and improves some well-known results.
References:
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