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偏導數 第二十六單元
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Partial Derivative Definition
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The Alternative Notations
To find We treat y as a constant and differentiate with respect to x To find We treat x as a constant and differentiate with respect to y
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Example
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Geometric Interpretations of the Partial Derivatives
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Geometric Interpretations of the Partial Derivatives
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Example
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Example
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Example
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High Order Partial Derivative
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Example
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Limit
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Continuity at a Point
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Example
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Equality of Mixed Partials
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Counterexample
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Counterexample
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Counterexample
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Checking continuity at (0,0)
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Dog Saddle
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單元結語 以前考慮單變數函數時,變化只有一個方向(x軸),因為現在考慮雙變數,固定了其中一個變數,於是出現了偏導數。
研究雙變數函數相關的章節,因為幾何意義為3D圖,這些需要讀者的體會及想像。
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