Bourbaki

Corollary 1

Tag 01CE, permanent. Cite it as [Bourbaki, Tag 01CE].

Lie Groups and Lie Algebras, chapter IX, § 4. Root system associated to a compact group

There are only finitely-many closed subgroups of G containing T.

Let H be such a subgroup; then H0∈HH_0\in \mathscr{H}, and H\mathscr{H} is finite. Moreover, H is a subgroup of NG(H0)N_G(H_0) containing H0H_0, and NG(H0)/H0N_G(H_0)/H_0 is finite (§2, no. 4, Prop. 4 and Remark 2).

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.

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Transcribed from the printed volume. Not translated.