On the oscillation of certain functional differential equations via comparison methods

Abstract Several new criteria for the oscillation of the functional differential equations of the form d dt 1 a n−1 (t) d dt 1 a n−2 (t) d dt ⋯ 1 a 1 (t) d dt x(t) α ±q(t)f x g(t) =0 are established in this paper.