Stirrup Curve

$\begin{figure}\begin{center}\BoxedEPSF{StirrupCurve.epsf scaled 501}\end{center}\end{figure}$

A plane curve given by the equation

$\begin{displaymath} (x^2-1)^2=y^2(y-1)(y-2)(y+5). \end{displaymath}$

References

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