Oscillation Of Two Kinds Of Second-order Neutral Delay Differential Equations

This thesis is divided into two chapters.Chapter 1,this chapter studies a kind of second order neutral delay differential equation(?)whereaandbare ratios of odd positive integers.Several new oscillation criteria are given.The results obtained here extend,complement and simplify a number of related ones in the literature.Chapter 2,this chapter considers the oscillation of a kind of second order neutral delay differential equations with superliner neutral term(?)whereaandbare ratios of odd positive integers anda31.New sufficient conditions for oscillation of the differential equations are obtained on the base of the existing results.