Oscillation for System of Delay Difference Equations*

Consider the system of delay difference equations l n xi t. yxi tys . q pi jkxj tyt k.s0, ). ks1 js1 where pi jkg y`, `., s and t kg 0, `., i, js1, 2, . . . , n, ks1, 2, . . . , l. Suffi- cient conditions are obtained for all solutions of the system ). to be oscillatory.