First, it is discussed that the definition of adjoint pair and its equivalent condition, the sufficient condition of existence of adjoint pair is given.
先讨论伴随对定义及其等价条件，给出伴随对存在的一个充分条件；
The author discusses a class of general of singular boundary value problems by using the first integral method, and the necessary and sufficient condition of positive solutions was obtained.
运用首次积分法讨论了较广泛的一类常微分方程边值问题，得到了正解存在的充要条件。
In this paper, we first discuss when OWA bag mappings have a fixed identity, give the sufficient and necessary condition for OWA bag mappings having fixed-identity.
本文首先讨论了OWA袋映射何时带有固定单位，给出了OWA袋映射带有固定单位的充要条件。
The present paper deals with the sufficient and necessary condition of the final positive solutions of non-linear partial-difference equations and first presents the comparison theorem.
建立关于具有连续变量非线性偏差分方程存在最终正解的充要条件。
The necessary and sufficient condition of recurrent and ergodic properties are proved first in chapter 3, and under that condition we get the stationary distribution.
本文在第三章给出了常返和遍历的充要条件，在此条件下由平稳分布的定义得出了平稳分布的发生函数。
The necessary and sufficient condition of recurrent and ergodic properties are proved first in chapter 3, and under that condition we get the stationary distribution.
本文在第三章给出了常返和遍历的充要条件，在此条件下由平稳分布的定义得出了平稳分布的发生函数。
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