New Oscillation Criteria for Delay Difference Equations,

This paper is concerned with the oscillation of all solutions of the delay difference equations and where {pn} and {pi(n)} are sequences of nonnegative real numbers an k and ki are positive integers. New oscillation criteria of the forms for equation (*) and for equation (**) are obtained, where α = lim infn→∞ (1/k) Σn−1i=n−k pi and C(α) is the “the best possible” function of α in some sense