一阶线性时滞微分不等式

研究了一阶线性时滞微分不等式 x′(t) +p(t) x(τ(t) )≤ 0正解的不存在性 ,其中 p(t) ,τ(t)∈ C([t0 ,∞ ) ,[0 ,∞ ) ) ,τ(t)≤ t。

On generalized impulsive piecewise constant delay differential equations

A variation of parameters formula with Green function type and Gronwall type integral inequality are proved for impulsive differential equations involving piecewise constant delay of generalized type. Some results for piecewise constant linear and nonlinear delay differential equations with impulsive effects are obtained.They include existence and uniqueness theorems, a variation of parameters formula, integral inequalities, the oscillation property and some applications.