Bourbaki

Exercise 7, § 3

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

Theory of Sets, II, 125

A graph G is functional if and only if for each set X we have

G⟨G−1⟨X⟩⟩⊂X.\mathrm{G}\langle \overset{-1}{\mathrm{G}}\langle \mathrm{X}\rangle\rangle \subset \mathrm{X}.
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Transcribed from the printed volume. Not translated.