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偏導數 第二十六單元.

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Presentation on theme: "偏導數 第二十六單元."— Presentation transcript:

1 偏導數 第二十六單元

2 Partial Derivative Definition

3 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

4 Example

5 Geometric Interpretations of the Partial Derivatives

6 Geometric Interpretations of the Partial Derivatives

7 Example

8 Example

9 Example

10

11 High Order Partial Derivative

12 Example

13 Limit

14 Continuity at a Point

15 Example

16 Equality of Mixed Partials

17 Counterexample

18 Counterexample

19 Counterexample

20 Checking continuity at (0,0)

21 Dog Saddle

22 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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