The Pseudosphere reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Pseudosphere

In geometry, a pseudosphere or tractricoid is the result of revolving a tractrix about its asymptote. It has constant negative Gauss curvature, except at the cusp, and therefore is locally isometric to a hyperbolic plane (everywhere except for the cusp).

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