单词	Directional Derivative
释义	Directional Derivative (1) is the rate at which the function changes at in the direction . Let be a Unit Vector in Cartesian Coordinates, so (2) then (3) The directional derivative is often written in the notation (4)
随便看	Idempotent Identity Identity Element Identity Function Identity Map Identity Matrix Identity Operator Idoneal Number Iff Ill-Conditioned Illumination Problem Illusion Image Imaginary Identity Imaginary Number Imaginary Part Imaginary Point Imaginary Quadratic Field Immanant Immersed Minimal Surface Immersion Impartial Game Implicit Function Implicit Function Theorem Implies

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