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第7章式18后结论的严谨性问题 #2

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UesugiErii opened this issue May 31, 2020 · 0 comments

UesugiErii commented May 31, 2020

在式18后，原文中有一句话，“从这个式⼦也可以明显看出 w波浪和 w* 是同号的。”

实际上上面这句话仅在

时成立，当小于等于时，需要另外考虑

下面和书中一样只讨论w*>0的情况，负数同理可证

当w波浪>0时，导数为正
当w波浪<0时，导数为负
所以当w波浪=0时取到最小值
这样才能解释为什么最后会有一个max

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