A

David

Darling

bicorn

bicorn

Bicorn with a = 1.


A bicorn, also known as the cocked-hat, is any of a collection of quartic curves studied by James Sylvester in 1864 and by Arthur Cayley in 1867. The bicorn has the Cartesian equation

 

y2(a2 - x2) = (x2 + 2ay - a)2