Periodic solutions for a kind of second-order neutral differential systems with deviating arguments

By means of the generalized continuation theorem of coincidence degree theory, a kind of second-order neutral differential systems with deviating arguments as followsd^2dt^2(x(t)+Cx(t-r))+ddtgradF(x(t))+gradG(x([email protected](t)))=p(t)is studied. A new result on the existence of periodic solutions is obtained, which relates to the deviating arguments @t(t) and r.

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