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On Hilbert Covariants
Published online by Cambridge University Press: 20 November 2018
Abstract
Let $F$ denote a binary form of order
$d$ over the complex numbers. If
$r$ is a divisor of
$d$, then the Hilbert covariant
${{H}_{r,\,d}}\,\left( F \right)$ vanishes exactly when
$F$ is the perfect power of an order
$r$ form. In geometric terms, the coefficients of
$H$ give defining equations for the image variety
$X$ of an embedding
${{\text{P}}^{r}}\,\to \,{{\text{P}}^{d}}$. In this paper we describe a new construction of the Hilbert covariant and simultaneously situate it into a wider class of covariants called the Göttingen covariants, all of which vanish on
$X$. We prove that the ideal generated by the coefficients of
$H$ defines
$X$ as a scheme. Finally, we exhibit a generalisation of the Göttingen covariants to
$n$-ary forms using the classical Clebsch transfer principle.
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- Research Article
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- Copyright © Canadian Mathematical Society 2014