Oscillation criteria for nth-order forced functional differential equations

In this paper, by using the method of general means, some new oscillation criteria for forced functional differential equations of the form x(n)(t )+ n−1 i=1 aix(i)(t )+q(t)f x g(t) = e(t ), t0 0, are established, where ai are real constants, q(t), f (t), e(t ), and g(t) are real continuous functions, xf (x) > 0 whenever x = 0, and limt→∞g(t)=∞.  2003 Elsevier Science (USA). All rights reserved