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Cushion

\begin{figure}\begin{center}\BoxedEPSF{Cushion.epsf}\end{center}\end{figure}

The Quartic Surface resembling a squashed round cushion on a barroom stool and given by the equation


\begin{displaymath}
z^2x^2-z^4-2zx^2+2z^3+x^2-z^2-(x^2-z)^2-y^4-2x^2y^2-y^2z^2+2y^2z+y^2=0.
\end{displaymath}

See also Quartic Surface


References

Nordstrand, T. ``Surfaces.'' http://www.uib.no/people/nfytn/surfaces.htm.




© 1996-9 Eric W. Weisstein
1999-05-25