Rationality of normal forms of isotropy strata of a representation of a compact Lie group
Résumé
In this article we study the isotropy stratification of a linear representation $V$ of a compact Lie group $G$. We prove that the closed isotropy strata are real algebraic manifolds and that for each isotropy subgroup $H$, every rational invariant of the induced representation $(V^{H},N(H))$ can be obtained as the restriction of a global invariant of $(V,G)$, where $N(H)$ is the normalizer of $H$ and $V^{H}$ is the fixed point set of $H$.
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