给出了两种常微分方程教材中关于奇解与包络关系结论的反例。
In this paper, some counter examples to the conclusions of singular solution and envelope in two textbooks of ordinary differential equation are given.
佩奇说“每个人都一样，当你对某事一知半解，你就更想了解它。”
“It will be included in people’s brains,” said Page. “When you think about something and don’t really know much about it, you will automatically get information.”
本文用微分不等式证明了二阶奇摄动系统解的存在性、唯一性和周期性。
This paper proves the existence, uniqueness and periodic problem of the solution about second order singular perturbation system by using the differential inequality.
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