We obtain a sufficient condition which the general transportation problems have optimal signature.
得到一般运输问题有最优符号差的一个充分条件。
This paper deals with the extinction of solutions on two dimension parabolic problems. A sufficient condition interrelated with the domain which leads to extinction of the solutions is given.
本文考虑二维区域上的一类非线性抛物问题解的熄灭性，给出了一个导致解熄灭的与区域相关的充分条件。
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。
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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