Periodic solutions of the neutral Duffing Equations

Z. Wang, Hunan University, Changsha, P. R. China
Z. Zhang, Hunan University, Changsha, P. R. China
J. Yu, Hunan University, Changsha, P. R. China

E. J. Qualitative Theory of Diff. Equ., No. 5. (2000), pp. 1-14.

Abstract: We consider the neutral delay Duffing Equations of the form
$$ax''(t)+bx'(t)+cx(t)+g(x(t-\tau_1), \ x'(t-\tau_2), x''(t-\tau_3))=p(t)=p(t+2\pi).$$
and establish a sufficient coudition for the existence of $2\pi$-periodic solution of above equations.

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