Periodic Solution of Integro-Differential Equations for the Second Order of the Operators

In this paper, we investigate the existence, uniqueness and stability of a periodic solution of integro-differential equations of second order with the operators by using the method of Samoilenko [7]. These investigations lead us to improving and extending the above method. Thus the integro-differential equations with the operators are more general and detailed than those introduced by Butris [2].