Remark 3

Tag 00Z2, permanent. Cite it as [Bourbaki, Tag 00Z2].

Lie Groups and Lie Algebras, chapter VIII, § 2. Root system of a split semi-simple Lie algebra

Recall that, by Chap. VI, §1, no. 3, Cor. of Prop. 9, the integer $p+q+ 1$ can only take the values $1,2,3,4$ .

Bourbaki sets the proof directly after the statement, and the corpus does not separate them, so what is above is the statement and its proof together.

Cited by

Nothing.

Cites

Chap. VI, §1, no. 3, Cor. of Prop. 9 not in this corpus