This paper deals with the following second order neutral differential equation of the formwhere z(t) = x(t) + a(t)x(t − τ ) + b(t)x(t + δ), andWe obtain some new oscillation criteria which extend some known results. Examples are presented to illustrate the main results.

In this paper we obtain new criteria for the oscillation of all solutions of second order neutral differential equations with nonpositive neutral term, which improve some of the results in [1].Examples are provided to illustrate the main results.

In this paper, we obtained some sufficient conditions for the oscillation of all solutions of the second order neutral differential equation of the form t r t 0 d ∞ < ∞. Examples are provided to illustrate the main results.

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