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Quadric

An equation of the form

\begin{displaymath}
{x^2\over a^2+\theta}+{y^2\over b^2+\theta}+{z^2\over c^2+\theta}=1,
\end{displaymath}

where $\theta$ is said to be the parameter of the quadric.




© 1996-9 Eric W. Weisstein
1999-05-25