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Periodic solutions to a kind of delay Duffing equation. (Chinese. English summary) Zbl 0921.34066

Summary: The Duffing equation \(ax''+bx+g(x(t-\tau))=p(t)\) is considered, using the theory of coincidence degree. A sufficient condition for the existence of at least one \(2\pi\)-periodic solution is obtained.

MSC:

34K13 Periodic solutions to functional-differential equations
34C25 Periodic solutions to ordinary differential equations
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