Some conditions on the existence of the first integral are given via the properties of equilibria and limit sets.

利用奇点和有限集的特征，给出了首次积分存在的某些条件。

youdao

By the first integral method, the existence, uniqueness and nonexistence of solutions for some nonlinear ordinary differential equations with singular boundary condition are discussed.

用首次积分法，讨论了带奇异边界条件的非线性常微分方程解的存在性、不存在性和唯一性。

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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。

youdao

This, she explains to the class at her Cookery Magic school, will be an integral part of the first dish, otak-otak.

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In contrast, the principal characters in Lady Murasaki's "The Tale of Genji, " the Japanese epic often cited as the first novel, delight in music, which is an integral part of court life.

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