Bourbaki

Exercice 8, § 4

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

Théorie des ensembles, I

Soient AA et RR des relations de T\mathscr{T}, TT un terme de T\mathscr{T}, xx une lettre. Si (T∣x)A(T \mid x)A est un théorème de T\mathscr{T}, (T∣x)R⇒(∃Ax)R(T \mid x)R \Rightarrow (\exists Ax)R, et (∀Ax)R⇒(T∣x)R(\forall Ax)R \Rightarrow (T \mid x)R sont des théorèmes de T\mathscr{T}.

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