Pjy. Wong et Rp. Agarwal, SUMMATION AVERAGES AND THE OSCILLATION OF 2ND-ORDER NONLINEAR DIFFERENCE-EQUATIONS, Mathematical and computer modelling, 24(9), 1996, pp. 21-35
Using summation averaging technique, we shall offer new oscillation cr
iteria for the second-order difference equation Delta(2)y + A(k, y) =
B (k, y, Delta y), k greater than or equal to k(0). Examples which dwe
ll upon the importance of our results are also included.