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Soit-f-E-F-une-application-P-E-est-l-ensemble-des-parties-de-E-Montrer-que-f-est-injective-A-P-E-A-f-1-f-A-




Question Number 161204 by mathocean1 last updated on 14/Dec/21
Soit f: E→F , une application.  P(E) est l′ensemble des parties  de E.  Montrer que f est injective ⇔ ∀ A ∈ P(E), A ⊂ f^(−1) (f(A))
Soitf:EF,uneapplication.P(E)estlensembledespartiesdeE.MontrerquefestinjectiveAP(E),Af1(f(A))

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