Remark 1
Tag 0AQL, permanent. Cite it as [Bourbaki, Tag 0AQL].
Lie Groups and Lie Algebras, chapter V, § 3. Groups of displacements generated by reflections
Since W is generated by reflections with respect to the walls of the chamber C, the preceding proposition gives a criterion for W to be finite. We shall return to this question in no. 9.
Bourbaki puts the proof directly after the statement, so what is above is the statement and its proof together.
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