Corollary 1
Tag 03QY, permanent. Cite it as [Bourbaki, Tag 03QY].
Theory of Sets, chapter III, § 3. Equipotent sets. Cardinals
Given any two sets, one of them is equipotent to a subset of the other.
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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