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Line 15: A degree ''n'' form itself is a covariant of degree ''n'' and order 1. The Hessian covariant of a form {{harvtxt\|Hilbert\|1993\|loc=p.88}} is the determinant of the [[Hessian matrix]] :<math>~~</math>~~H(f) = \begin{bmatrix} \frac{\partial^2 f}{\partial x^2} & \frac{\partial^2 f}{\partial x\,\partial y} \\ \frac{\partial^2 f}{\partial y\,\partial x} & \frac{\partial^2 f}{\partial y^2} \\ \end{bmatrix}.</math> It is a covariant of degree 2''n''− 4 and order 2.

Invariant of a binary form: Difference between revisions