Boundedness of solutions to a retarded Liénard equation
نویسندگان
چکیده
This paper is concerned with the following retarded Liénard equation x(t) + f1(x(t))(x (t)) + f2(x(t))x (t) + g1(x(t)) + g2(x(t− τ(t))) = e(t). We prove a new theorem which ensures that all solutions of the above Liénard equation satisfying given initial conditions are bounded. As one will see, our results improve some earlier results even in the case of f1(x) ≡ 0.
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