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	Rhodonea Rhomb Rhombic Dodecahedral Number Rhombic Dodecahedron Rhombic Icosahedron Rhombicosacron Rhombicosahedron Rhombicosidodecahedron Rhombic Polyhedron Rhombic Triacontahedron Rhombicuboctahedron Rhombidodecadodecahedron Rhombihexacron Rhombihexahedron Rhombitruncated Cuboctahedron Rhombitruncated Icosidodecahedron Rhombohedron Rhomboid Rhomboidal Dodecahedron Rhombus Rhumb Line Ribbon Knot Ribet's Theorem Riccati-Bessel Functions Riccati Differential Equation

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