**Gradient - Wikipedia**
https://en.wikipedia.org/wiki/Gradient

In vector calculus, the gradient of a scalar-valued differentiable function f of several variables is the vector field (or vector-valued function) whose value at a point is the vector whose components are the partial derivatives of at . That is, for , its gradient is defined at the point in n-dimensional space as the vector The nabla symbol , written as an upside-down triangle and pronounced "del", denotes the vector …

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