The bicorn is the name of a collection of Quartic Curves studied by Sylvester in 1864 and Cayley
in 1867 (MacTutor Archive). The bicorn is given by the parametric equations

The graph is similar to that of the Cocked Hat Curve.

**References**

Lawrence, J. D. *A Catalog of Special Plane Curves.* New York: Dover, pp. 147-149, 1972.

MacTutor History of Mathematics Archive. ``Bicorn.'' http://www-groups.dcs.st-and.ac.uk/~history/Curves/Bicorn.html.

© 1996-9

1999-05-26