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Periodic solutions for a kind of second order neutral functional differential equations. (English) Zbl 1130.34331

Criteria are established for the existence of periodic solutions to a second order sublinear neutral differential equation. The method is based on some a-priori estimation and the continuation argument using the coincidence degree. The sublinear condition is an improvement of the boundedness condition required in some recent literatures.

MSC:

34K13 Periodic solutions to functional-differential equations
34K40 Neutral functional-differential equations
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