冰冻 发表于 2025-3-21 19:31:47
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s to the derivatives of f at Po ; each of these (partial) derivatives of the linear function is the ratio of two determinants. The derivatives off at Po are defined to be the limits of these ratios as PI and P2 approach Po (subject to an important regularity condition). This simple example is only the beginni978-1-4612-9747-5978-1-4612-5228-3insipid 发表于 2025-3-22 15:36:09
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ifferentiation and integration of such functions. Although many of the topics are familiar, the treatment is new; the book developed from a new approach to the theory of differentiation. Iff is a function of two real variables x and y, its deriva tives at a point Po can be approximated and found asRegurgitation 发表于 2025-3-22 23:56:07
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