“gradient operator”的概念、定义、翻译、参考文献-科学参考

单词	gradient operator
释义	gradient operator Physics The operator $\nabla = i \partial / \partial x + j \partial / \partial y + k \partial / \partial z,$ where i, j, and k are unit vectors in the x, y, and z directions. Given a scalar function f and a unit vector n, the scalar product n. ∇f is the rate of change of f in the direction of n. See also curl; divergence.
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