The Pseudosphere

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Introduction:

Although the pseudosphere may not look much like a sphere, it has the same constant negative Gaussian curvature. It is the surface of revolution of a tractrix.

Definition:

Properties:

Tangent Planes:

At u = u0, v = v0, the tangent plane to the surface is parameterized by:

Infinitesimal Area:

The infinitesimal area of a patch on the surface is given by

Gaussian Curvature:

Gaussian curvature of the surface.
Surface colored by Gaussian curvature.

Mean Curvature:

Mean curvature of the surface.
Surface colored by Mean curvature.