获得了一类一阶可变号非线性奇异初值问题的新结果。

New existence results are presented for the first-order nonlinear singular initial problems. Here the non-linearity can change the sign.

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文摘：获得了一类一阶可变号非线性奇异初值问题的新结果。

Abstract: New existence results are presented for the first-order nonlinear singular initial problems. Here the non-linearity can change the sign.

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研究了奇异线性系统初值问题解存在唯一的充要条件，并给出了其求解公式。

Sufficient and necessary conditions for existence and uniqueness of solutions for initial value problems of singular system are studied in this paper, and the formula of solution is given.

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