In this paper, We prove that the orthogonal condition to solve the uniform asymptotic solution of second order linear P. D. E in periodic region is the necessary and sufficient condition.
本文证明了求解周期区域上的二阶线性偏微分方程的一致有效渐近解的正交条件是充分和必要的。
In the second chapter, we study weakly recurrence of the Markov in random environment, and provide the sufficient condition for weakly recurrence.
在第二章，研究了随机环镜中的马氏链的弱常返性，给出了弱常返性的一个充分条件。
Second, a method to determine the stability of transfer matrix , using a sufficient condition based on spectral radius, is discussed.
然后探讨了传递谱半径判据得到人工边界稳定性近似稳定性准则的方法可能存在的问题。
Then, the latter necessary and sufficient condition is generalized to the case for the two different point ranges of degenerate second order curve.
然后，再将非退化二阶曲线到自身的双射为对合的充要条件推广到退化二阶曲线两相异点列的情形。
Then, the latter necessary and sufficient condition is generalized to the case for the two different point ranges of degenerate second order curve.
然后，再将非退化二阶曲线到自身的双射为对合的充要条件推广到退化二阶曲线两相异点列的情形。
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