Oscillation Of Nonlinear Delay Neutral Difference Equations

This paper is concerned with the oscillation of nonlinear - - neutral difference equation with several delay:where p(n), q(n) are real numbers with p(n) > 0, q(n) > 0 and q(n) ^ 0,T and Oi are nonnegative for i =1l,2,.....,m. QJ > is the forward difference operator:We establish several oscillation criteria of all solutions and existence results ofnonoscillatory solutions for this equation.