With Time Delay Of The Partial (often) Functional Differential Equations Oscillation Criterion

This thesis is devoted to studying oscillation for several partial (ordinary) functional differential equations. The oscillation criteria which in this thesis we establish generalize and improve some known results.In chapter 1 we introduce and summarize the background , present situation and main contents of oscillation for functional differential equations.In chapter 2 we study oscillation for a class of second order nonlinear neutral delay differential equationsand obtain sufficient conditions for oscillation.In chapter 3 we study oscillation for a class of oscillation criteria for higher order hyperbolic type differential equations with distribute delay of the formand have some oscillation criteria for this equation.In chapter 4 we establish oscillation theorems for another class of oscillation criteria for higher order nonlinear neutral type differential equations with distribute delay of the form...