WebLecture12: Gradient The gradientof a function f(x,y) is defined as ∇f(x,y) = hfx(x,y),fy(x,y)i . For functions of three dimensions, we define ∇f(x,y,z) = hfx(x,y,z),fy(x,y,z),fz(x,y,z)i . The symbol ∇ is spelled ”Nabla” and named after an Egyptian harp. Here is a very important fact: Gradients are orthogonal to level curves and ... http://paulklein.ca/newsite/teaching/matrix%20calculus.pdf
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