**The gradient vector | Multivariable calculus (article) | Khan Academy**
https://www.khanacademy.org/math/multivariable-calculus/multivariable-derivatives/partial-derivative-and-gradient-articles/a/the-gradient

WebThe gradient of a function f f, denoted as \nabla f ∇f, is the collection of all its partial derivatives into a vector. This is most easily understood with an example. Example 1: Two dimensions If f (x, y) = x^2 - xy f (x,y) = x2 −xy, which of the following represents \nabla f ∇f? Choose 1 answer:

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