“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.
随便看	polyribosome polysaccharide polysaccharide gum polysemy polysepalous polysilicon polysome polyspermy polystyrene polystyrene-film capacitor polysulphides polysyllogism polysynaptic reflex polysynthetic twin polytaxic times polyteny polytetrafluoroethene polytetrahedron polytheism polythene polythermal glacier polythetic polythionate polythionic acids polytomous

科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。