INTERVAL OSCILLATION CRITERIA FOR SECOND-ORDER FUNCTIONAL DIFFERENTIAL EQUATIONS

Abstract

This paper concerns the oscillation problem of a general class of second-order differential equations. New interval oscillation criteria for a class of second-order functional nonlinear differential equations with damping and forcing terms have been established by using the classical Riccati technique and averaging function of Philos type. Obtained results extend some of previous works and particularly answer a comment published previously. Illustrative examples also stated.