the_first_sufficient_condition

1.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；
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2.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。
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3.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。
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