Topic: Directional Derivatives and Gradients

Recovering a Gradient from Directional Measurements

Maximum and Minimum Directional Rates

Finding Directions for a Prescribed Rate of Change

Tangent Directions and Zero Directional Derivatives

Proving the Steepest-Ascent Direction

Tangent Planes to Implicit Level Surfaces

Normal Lines to Implicit Surfaces

Gradient Magnitude, Contours, and Rate of Change

Why Gradients Are Normal to Level Sets

Evaluating Directional Derivatives from Gradients