Oscillation of Nonlinear Delay Difference Equations1

In this paper, two interesting oscillation criteria are obtained for all solutions of the nonlinear delay difference equations of the form yn 1 yn pnfŽyn k. 0, n 0, 1, 2, . . . . Some applications are given to demonstrate the advantage of results obtained in this paper. Our results also improve the existing results in the literature even when applying them to the linear delay difference equation