catenary | elliptic curve | Elliptic rational functions | elliptic filter | Elliptic curve primality testing | Elliptic curve primality proving |
In geometry, an unduloid, or onduloid, is a surface with constant nonzero mean curvature obtained as a surface of revolution of an elliptic catenary: that is, by rolling an ellipse along a fixed line, tracing the focus, and revolving the resulting curve around the line.