Remark
Tag 0ASZ, permanent. Cite it as [Bourbaki, Tag 0ASZ].
Lie Groups and Lie Algebras, chapter V, § 5. Invariants in the symmetric algebra
When , G is a Coxeter group and H is the set of reflections belonging to G, we know (§ 3) that the elements of H are in one-to-one correspondence with the walls of V.
Bourbaki puts the proof directly after the statement, so what is above is the statement and its proof together.
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