Quippian

In mathematics, a quippian is a degree 5 class 3 contravariant of a plane cubic introduced by Arthur Cayley (1857) and discussed by Igor Dolgachev (2012, p.157). In the same paper Cayley also introduced another similar invariant that he called the pippian, now called the Cayleyan.

See also

• Glossary of classical algebraic geometry

References

• Cayley, Arthur (1857), "A Memoir on Curves of the Third Order", Philosophical Transactions of the Royal Society of London (The Royal Society) 147: 415–446, doi:10.1098/rstl.1857.0021, ISSN 0080-4614 
• Dolgachev, Igor V. (2012), Classical Algebraic Geometry: a modern view, Cambridge University Press, ISBN 978-1-107-01765-8, http://www.math.lsa.umich.edu/~idolga/CAG.pdf