Example 1

Tag 03RZ, permanent. Cite it as [Bourbaki, Tag 03RZ].

Theory of Sets, chapter II, § 1. Collectivizing relations

The relation $x \in y$ is clearly collectivizing in $x$ .

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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