Bourbaki

Exercice 2, § 3

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Théorie des ensembles, II

Soit G un graphe. Montrer que la relation X⊂pr1 GX \subset \mathrm{pr}_1\ G est équivalente à X⊂G‾⟨G⟨X⟩⟩X \subset \overline{G}\langle G\langle X\rangle \rangle.

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