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Periodic solutions for $$n^{\text{th}}$$ order functional differential equations. (English) Zbl 1202.34121
A class of $$n$$th-order functional differential equations is considered, and some sufficient conditions for the existence of periodic solutions are established. The approach is based on the coincidence degree theory of Mawhin. The main theorem is illustrated by an example.

##### MSC:
 34K13 Periodic solutions to functional-differential equations 47N20 Applications of operator theory to differential and integral equations
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