Bourbaki

Exercise 1, § 3

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

Theory of Sets, II, 124

Show that the relations x∈yx \in y, x⊂yx \subset y, x={y}x = \{y\} have no graph with respect to xx and yy.

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Transcribed from the printed volume. Not translated.