quippian
In mathematics, a quippian is a degree 5 class 3 contravariant of a plane cubic introduced by {{harvs|txt|first=Arthur|last=Cayley|authorlink=Arthur Cayley|year=1857}} and discussed by {{harvs|txt|first=Igor|last=Dolgachev|authorlink=Igor Dolgachev|year=2012|loc=p.157}}. In the same paper Cayley also introduced another similar invariant that he called the pippian, now called the Cayleyan.
See also
References
- {{Citation | last1=Cayley | first1=Arthur | author1-link=Arthur Cayley | title=A Memoir on Curves of the Third Order | jstor=108626 | publisher=The Royal Society | year=1857 | journal=Philosophical Transactions of the Royal Society of London | issn=0080-4614 | volume=147 | pages= 415–446 | doi=10.1098/rstl.1857.0021| doi-access=free }}
- {{Citation | authorlink=Igor Dolgachev | last1=Dolgachev | first1=Igor V. | title=Classical Algebraic Geometry: a modern view | url=http://www.math.lsa.umich.edu/~idolga/CAG.pdf | publisher=Cambridge University Press | isbn=978-1-107-01765-8 | year=2012}}