info prev up next book cdrom email home

Hessian Covariant


\begin{displaymath}
H\equiv\vert aa'a''\vert a_{x^{n-2}}a'_{x^{n-2}}a''_{x^{n-2}}=0.
\end{displaymath}

The nonsingular inflections of a curve are its nonsingular intersections with the Hessian.


References

Coolidge, J. L. A Treatise on Algebraic Plane Curves. New York: Dover, pp. 79, 95-98, and 151-161, 1959.




© 1996-9 Eric W. Weisstein
1999-05-25