Remark 1
Tag 0APE, permanent. Cite it as [Bourbaki, Tag 0APE].
Lie Groups and Lie Algebras, chapter V, § 1. Hyperplanes, chambers and facets
It follows from formula (6) and Prop. 9 that the closure of a chamber is the intersection of the closed half-spaces that are bounded by a wall of and contain .
Bourbaki puts the proof directly after the statement, so what is above is the statement and its proof together.
Cited by
Nothing.