第十五周前半。
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@@ -84,7 +84,7 @@
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\begin{definition}
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令
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\[Jf(\bvec{x}) = (D_1 f(\bvec{x}), D_2f(\bvec{x}), \dots, D_n f(\bvec{x}))\]
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并称它为函数$f$在点$\bvec{x}$处的Jacobian。函数的Jacobian也常记为$\gra f$或$\nabla f$,即
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并称它为函数$f$在点$\bvec{x}$处的Jacobian。函数的Jacobian也常记为$\gra f$或$\gradient f$,即
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\[\gra f(\bvec{x}) = J f(\bvec{x})\]
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称之为数量函数$f$的梯度。
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\end{definition}
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