Who Invented the Bicorn?

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.

Who discovered the bicorn curve?

The [bicorn] is the name of a collection of quartic curves studied by Sylvester in 1864 and Cayley in 1867. It is given by y2(a2 − x2)=(x2 + 2ay − a2)2.

When was the bicorn invented?

The bicorne or bicorn (two-cornered) is a historical form of hat widely adopted in the 1790s as an item of uniform by Europe and American army and naval officers. Most generals and staff officers of the Napoleonic period wore bicornes, which survived as widely-worn full-dress headdress until the 20th century.