About Sign-Constancy of Green's Functions for Impulsive Second Order Delay Equations
We consider a second order delay differential equation with impulses. In this paper we find necessary and sufficient conditions of positivity of Green's functions for this impulsive equation coupled with one or two-point boundary conditions in the form of theorems about differential inequalities. By choosing the test function in these theorems, we obtain simple sufficient conditions.
תאריך עדכון אחרון : 01/06/2014