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max min concave convex關系
Sep 5th 2013, 00:52

想請問 max min concave convex關系， 我好像搞混了

max條件是二階微分小於零，min大於零
concave條件也是二階微分小於零，convex 二階微分大於零
那這樣在某一函數中，我有max 豈不等於我也有concave???

有一例題是 e的-(X-3)平方，F.O.C後求出x=3，S.O.C後f''(3)<0是 MAX，然而這個函數卻neither concave or convex 是為什麼呢?

不知道看不看得懂我打得....總之謝謝囉

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