Bourbaki

Exercice 2, § 6

Tag 03J0, permanent. Cite it as [Bourbaki, Tag 03J0].

Théorie des ensembles, II, p. 51

Si GG est un graphe tel que G∘G‾∘G=GG \circ \overline{G} \circ G = G, montrer que G‾∘G\overline{G} \circ G et G∘G‾G \circ \overline{G} sont des graphes d’équivalences dans pr⁡1G\operatorname{pr}_1 G et pr⁡2G\operatorname{pr}_2 G respectivement.

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Transcribed from the printed volume. Not translated.