Oscillation properties of solutions of second order nonlinear neutral delay difference equations. (English) Zbl 0904.39010
Under some assumptions, to complicate to be presented here, the authors prove that the inequality
\[
\Delta^2(y_n+\lambda y_{n-k})+ q_n g(y_{n+ a-1})\leq 0
\]
has no eventually positive solution. Two similar theorems are obtained as conclusions of the theorem from above.
Reviewer: D.Bobrowski (Poznań)