Existence of Positive Solutions for Delay Differential Equations with Impulses*

A powerful comparison result and some effective sufficient conditions for existence of positive solutions of the delay differential equation with impulses ¡ n ~x9 t . q pi t . x tyt i . s0, t/tk ) is1 . ¢ x tq. yx t . sb x t ., ks1, 2, . . . , k k k k are obtained by establishing the equivalence of existence of positive solutions of ). and solutions of an integral equation.