Research On Oscillation For Tow Classes Third-order Nonlinear Differential Equations

A certain kind of oscillation of the third order nonlinear neutral delay differential equation and A certain kind of oscillation of the third order nonlinear neutral a lot of delay differential equation is studied in this paper. By using the operator, the integrating skills, and some new sufficient conditions judging the sort of oscillation of equations are established with the help of appropriate comparison theorems, the theorems obtained promote and improve some conclusions in some latest literatures, the results response the effect of the delay in the oscillation of equations. Then we give some concrete examples to illustrate these main conclusions.