Remark 1
Tag 0ANX, permanent. Cite it as [Bourbaki, Tag 0ANX].
Lie Groups and Lie Algebras, chapter IV, § 2. Tits Systems
Assumptions (2), (3), (4) were not used in the proof that (G', B', N', S') is a Tits system.
Bourbaki puts the proof directly after the statement, so what is above is the statement and its proof together.
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