[分析] 不可微但各方向偏導數爲零
想請問一下 是否有實函數定義在R^2
在（0,0）不可微 但是各方向導數都存在且為0
常看到不可微但各方向導數存在的例子中 並非都0
謝謝！
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推
02/26 22:36, , 1F
02/26 22:36, 1F
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02/26 22:36, , 2F
02/26 22:36, 2F
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02/27 02:52, , 3F
02/27 02:52, 3F
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02/27 03:18, , 4F
02/27 03:18, 4F
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02/27 03:18, , 5F
02/27 03:18, 5F
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02/27 03:19, , 6F
02/27 03:19, 6F
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02/27 03:19, , 7F
02/27 03:19, 7F
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02/27 04:17, , 8F
02/27 04:17, 8F
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02/27 04:17, , 9F
02/27 04:17, 9F
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02/27 12:36, , 10F
02/27 12:36, 10F
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02/27 19:00, , 11F
02/27 19:00, 11F
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02/27 19:02, , 12F
02/27 19:02, 12F
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02/27 19:02, , 13F
02/27 19:02, 13F