In geometry, a superegg is a solid of revolution obtained by rotating an elongated super-ellipse with exponent greater than 2 around its longest axis. It is a special case of super-ellipsoid. Unlike an elongated ellipsoid, an elongated superegg can stand upright on a flat surface, or on top of another superegg. This is due to its curvature being z...
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http://en.wikipedia.org/wiki/Superegg
The surface of revolution of a superellipse given by the formula -x/a-
2.5 + -y/b-
2.5 = 1, where a/b = 4/3. The superegg was named by Piet Hein and singled out by him because of an unusual property: stood on either end it has a peculiar and surprising sta...
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http://www.daviddarling.info/encyclopedia/S/superegg.html
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