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The general ternary form can be recovered by its Hessian
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math.AG
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hessianformsternaryactionanalogousbinarybirationalconsidering
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abstract
The Hessian map is the rational map that sends a homogeneous polynomial to the determinant of its Hessian matrix. We prove that the Hessian map is birational on its image for ternary forms of degree $d\ge 4$, $d\neq 5$, by considering the action of the orthogonal group. In a previous paper we proved the analogous result for binary forms, with more geometric techniques.
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