Exercice 3, § 4

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

Théorie des ensembles, II, p. 50

Soient $X, Y, Y', Z$ quatre ensembles. Montrer que si $Y \cap Y' = \varnothing$ , on a

(Y' \times Z) \circ (X \times Y) = \varnothing, \text{ et si } Y \cap Y' \neq \varnothing, \text{ on a } (Y' \times Z) \circ (X \times Y) = X \times Z.

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