“directional derivative”的概念、定义、翻译、参考文献-科学参考

单词	directional derivative
释义	directional derivative Mathematics The rate of change of a scalar function in a given direction, Given a scalar field f:ℝ³→ℝ, a point p and a unit vector u, then the directional derivative of f at p in the direction u equals the limit $lim_{t \to 0} \frac{f (p + t u) - f (p)}{t} .$ It also equals ∇f∙u, so that if u = i, then the directional derivative equals ∂f/∂x.
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