Some new criteria of oscillation or non-oscillation are presented for certain nonlinear secondorderdifference equations. Several examples are given to illustrate the results.
对一类二阶非线性差分方程的解给出了几个振动或非振动的判定定理，并举例说明了定理的应用。
2
Chapter 3 is centered around the existence of periodical solutions for non self-adjoint nonlinear secondorderdifference equations by invoking matrix theory and coincide degree theory.
第三章利用矩阵理论与重合度理论，讨论了一类非自共轭非线性二阶差分方程周期解的存在性问题。
3
The main contents of first chapter are several difference schemes of first-order and second-order differential equations.