Curvature for the General Paraboloid - Differential Geometry - NJ Wildberger

Explore the curvature of a general paraboloid in this advanced differential geometry lecture. Delve into a novel approach that generalizes the discussion of paraboloids as quadrics tangent to the plane at infinity. Learn how to represent paraboloids algebraically using projective 4x4 matrices and derive their Cartesian equations. Discover how curvature relates to linear algebra through the characteristic polynomial of a symmetric matrix. Examine two types of curvature at the origin: the first related to mean curvature and the second equivalent to Gaussian curvature. Gain insights into higher-dimensional generalizations of surface curvature through this mathematical exploration.

Introduction
Paraboloid
Parameters
Equation
Defining curvature
The characteristic polynomial
Invariant under scaling