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Jacobian.md

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$f : \mathbb{R}^n \to \mathbb{R}^m$$C^1$ 连续,则Jacobian matrix$m\times n$ 矩阵: $$J(f) \in Mat_{m \times n}(C^0(\mathbb{R}, \mathbb{R}))$$ $$J(f)^i_j := \frac{\partial f^i}{\partial x^j},,,,,,,,i=1,\ldots,m; j = 1,\ldots,n,$$ 其中 $x = (x^1,\ldots,x^n)$