Dumbbell Curve

$\begin{figure}\begin{center}\BoxedEPSF{Dumbbell.epsf}\end{center}\end{figure}$

$\begin{displaymath} y^2=a^2(x^4-x^6). \end{displaymath}$

References

Cundy, H. and Rollett, A. Mathematical Models, 3rd ed. Stradbroke, England: Tarquin Pub., p. 72, 1989.