One of the Plücker Characteristics, defined by
where is the class, the order, the number of nodes, the number of Cusps,
the number of stationary tangents (Inflection Points), and the number
See also Riemann Curve Theorem
Coolidge, J. L. A Treatise on Algebraic Plane Curves. New York: Dover, p. 100, 1959.
© 1996-9 Eric W. Weisstein