Oscillation Of A Class Neutral Functional Differential Equations

In this paper, we investigate a class of second order and higher order nonlinear neutral functional differential equations, by using a generalized Riccati transformation, and introducing parameter function and integrality square technic,we obtain some general criteria that ensure the oscillation of solutions.In section l,we investigate a class of second order neutral functional differential equationsand obtain some new criteria that ensure the oscillation of equations(l).In section 2, we investigate a class of higher order neutral functional differential equationsand obtain general criteria that ensure the oscillation of equations(2).