Abstract
Using the classical fixed point index for cones in a Banach space some criteria for the existence of periodic solutions of autonomous functional differential equations (t)=F(xt) are derived, regarding the asymptotic behaviour of F near zero and infinity. The general result is applied to equations with distributed time delay.
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Alt, W. Some periodicity criteria for functional differential equations. Manuscripta Math 23, 295–318 (1978). https://doi.org/10.1007/BF01171755
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DOI: https://doi.org/10.1007/BF01171755