*f(x,y) = (x^2 + y^2 )^2 -a*x^2*y*.

In polar coordinates, this curve is given parametrically as

*r(theta) = a sin(theta) [cos(theta)]^2*.

The parameter *a* scales the level set, but does not change its
topology.

Comments to: pisces@geom.umn.edu

Last modified: Sun Nov 26 16:29:03 1995

Copyright © 1995 by The Geometry Center, all rights reserved.