Then . with the help of some good results of differential equations theory, some sufficient conditions for all solutions of the equations to be oscillatory are obtained . the way is to proof by contradiction and construct sequence 1)的振動性,首先,利用積分變換,給出了幾個引理,將此類差分方程轉(zhuǎn)化為相應的微分方程或微分不等式,得出了新變量的一些重要性質(zhì);然后用反證法和構(gòu)造序列的方法,充分利用微分方程理論中的一些重要結(jié)論,得到此類差分方程解振動的若干充分條件