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第三十單元 極大與極小
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Extrema Definition (Relative Extrema)
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Definition (Relative Maximum)
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Extrema Definition (Relative Extrema)
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Definition (Relative Minimum)
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Theorem
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Critical Points A critical point of a function f defined on an open set S is a point (x0 , y0) in S where either one of the following is true
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Plot 3D
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Second Partial Test
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Second Partial Test
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Concavity
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Interpretation of Second Partial Test
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Interpretation of Second Partial Test
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Interpretation of Second Partial Test
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Interpretation of Second Partial Test
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Interpretation of Second Partial Test
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Example
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Example(continued)
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Plot 3D
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單元結語 因為現在考慮的狀況為雙變數函數,不像單變數函數為平面上的曲線那麼一目了然,使用二階導數判別法判斷極值是不錯的選擇。
二階導數判別的公式不只須會用,公式的原理一般微積分課本大都沒有解釋,故在此將其導出,加深同學隊公式的印象。 公式的推導與單變數的狀況類似,若看不懂內容,應複習微積分上學期的課程:導函數的應用。
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