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 )的振动性,首先,利用积分变换,给出了几个引理,将此类差分方程转化为相应的微分方程或微分不等式,得出了新变量的一些重要性质;然后用反证法和构造序列的方法,充分利用微分方程理论中的一些重要结论,得到此类差分方程解振动的若干充分条件
百科解释
In logic, proof by contradiction is a form of proof that establishes the truth or validity of a proposition by showing that the proposition's being false would imply a contradiction.