Corollary 2
Tag 03QZ, permanent. Cite it as [Bourbaki, Tag 03QZ].
Theory of Sets, chapter III, § 3. Equipotent sets. Cardinals
Two sets each of which is equipotent to a subset of the other are equipotent.
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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