Bourbaki

Exercice 2, § 6

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

Théorie des ensembles, III, p. 87

Montrer que si a,b,c,da, b, c, d sont quatre cardinaux tels que a<ca < c et b<db < d on a a+b<c+da + b < c + d et ab<cdab < cd (cf. III, p. 90, exerc. 21 c)).

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