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Yousseflaayali
@Yousseflaayali
April 2019
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Bsr mes amis svp comment mantrer que f est une fonction injective ?
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slyz007
Verified answer
Bonjour.
La façon la plus courante pour une application f de E vers F est de démontrer que :
(∀ (x;y) ∈ X²) f(x)=f(y) ⇒ x=y
On peut aussi utiliser la contraposée :
(∀ (x;y) ∈ X²) x≠y ⇒ f(x)≠f(y)
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Lista de comentários
Verified answer
Bonjour.La façon la plus courante pour une application f de E vers F est de démontrer que :
(∀ (x;y) ∈ X²) f(x)=f(y) ⇒ x=y
On peut aussi utiliser la contraposée :
(∀ (x;y) ∈ X²) x≠y ⇒ f(x)≠f(y)