| Definition: | symbolic notation expressed formally as a vector, used to denote scalar or vector differential operators operating at each point of a given space region on scalars or vectors, and which, in orthonormal Cartesian coordinates, is represented by ∇=ex∂∂ x+ey∂∂ y+ez∂∂ z where ex, ey, ez are unit vectors along the x, y, z axes NOTE It is recommended to print the symbol ∇ in boldface.
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