BOUNDEDNESS OF A CLASS OF SECOND-ORDER ORDINARY DIFFERENTIAL EQUATIONS AND SECOND-ORDER DIFFERENTIAL EQUATIONS WITH DELAY

In this paper, we discuss the boundedness of solutions of the following equations:(1)and(2) Assume that r(t), a(t), b(t), v(t), p(t) and h(t,y,u) are continuous functions with respect to their arguments, 0 ≤ r(t) ≤ τ, r(t) > 0; h(t,y,u)u ≥ 0 for t ≥ to > 0; f(y),g(y) are continuous functions.