scalar Δf associated at each point of a given space region with a scalar f, equal to the divergence of the gradient of the scalar field: Δf = div grad f NOTE 1 In orthonormal Cartesian coordinates, the Laplacian of a scalar field quantity is: . NOTE 2 The Laplacian of the scalar field f is denoted Δf or ∇2f, where Δ is the Laplacian operator.
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