45 - The gradient is perpendicular to level surfaces
42:11
46 - The implicit function theorem for systems of equations
27:53
38 - The gradient
23:06
Level Curves and Traces of Multivariable Functions
27:29
93 - Stokes' theorem
19:30
Orthogonality of level curves and the gradient vector
18:26
33 - The tangent plane
21:07
44 - Proof of the implicit function theorem
9:06