A

plane algebraic curve invented by

Descartes in 1638.
Although, it seems that Descartes was unable to sketch the
curve accurately. Challenge. Can you do better?

An equation for the curve is *x*^{3} + y^{3}=3axy
(for a real number constant *a*).

This curve has a singular point at the origin.

history sourced from http://www-groups.dcs.st-andrews.ac.uk/~history