Cartesian equation:
y2(a2 - x2) = (x2 + 2ay - a2)2

The bicorn (also called the cocked-hat) is the name of a collection of quartic curves studied by Sylvester in 1864. The same curves were the studied by Cayley in 1867.

The particular bicorn given by Sylvester and Cayley is a different quartic from the one given here but this one, with a simpler formula, has essentially the same shape.

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JOC/EFR/BS January 1997

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