A note on the gradient of a function.

I want to insert a note on (gradient of ). 1. It is not perpendicular to everything in the surface. Most proofs only go as far as to prove it is perpendicular to continuous parameterized curves. Nothing more. Stop reading too deeply into it. 2. It is mostly useful for finding perpendiculars to all parameterizedContinue reading “A note on the gradient of a function.”