The gradient is a vector operation that operates on a scalar function to produce a vector. The vector's magnitude is the maximum rate of change of the function at the point of the gradient, is pointed in the direction of that maximum rate of change.
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" is a vector and is pronounced "del." The scalar function is V(x,y,z), V(r,Φ,z), or V(r,θ,Φ)
The divergence of a gradient is know as the LaPlacian.
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Kirt Blattenberger, BSEE, UVM 1989