Example 2
Tag 03TT, permanent. Cite it as [Bourbaki, Tag 03TT].
Theory of Sets, chapter III, § 1. Order relations. Ordered sets
The set of subgroups of a group G, ordered by inclusion, is a lattice.
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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