Bourbaki

Corollary 2

Tag 0AJW, permanent. Cite it as [Bourbaki, Tag 0AJW].

Lie Groups and Lie Algebras, chapter III, § 9. Commutators, centralizers and normalizers in a Lie group

Let ρ\rho be a finite-dimensional semi-simple analytic linear representation of GG on a vector space VV, SS the symmetric algebra of VV and SGS^G the subalgebra of SS consisting of the elements invariant under (Sρ)(G)(S\rho)(G). Then SGS^G is a finitely generated algebra.

This follows from Theorem 1, Chapter I, § 6, Theorem 6 (a) and Commutative Algebra, Chapter V, § 1, Theorem 2.

Bourbaki puts the proof directly after the statement, so what is above is the statement and its proof together.

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