del

del

n. (Math.) a differential operator which, operating on a function of several variables, gives the sum of the partial derivatives of the function with respect to the three orthogonal spatial coordinates; -- also called the gradient or grad. It is represented by an inverted Greek capital delta (), and is thus because of its shape also called nabla, meaning harp in Hebrew.
[PJC]

 

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Fri 14th December 2018