Oscillation and Nonoscillation Theorems for Certain Second-Order Difference Equations with Forcing Term

In this paper we are concerned with some new criteria for the oscillation and nonoscillation of the second-order nonhomogeneous linear difference equations of the form D cny1 D xny1.qqnxnsfn, ns1, 2, . . . , where cn4, fn4, and qn4 are real sequences, cn)0 for nG0, and D xnsxnq1yxn is the forward difference operator. The discrete analogs of some of the known results in the continuous case are presented.