Oscillations for fisrt order differential equations

This thesis consists of three chapters. The first chapter is devoted to the introduction and provides a generel knowledge about the existing literatüre. In the second chapter, we give some basic definitions and preliminary that be used in further sections. In the third chapter we provide new sufficient conditions fort he oscillation of all solution of the neutral differential equation with variable coefficients d/dt(y(t)-R(t)y(t-r))+P(t)y(t-τ)-Q(t)y(t-σ)=0 Also, in the third chapter is corcorned with the oscillatory behaviour of first order delay differential equations of the form 〖x〗^' (t)+p(t)x(τ(t))=0, t≥t_0