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Que peut-on conclure sur ? ? ? si ? et ? sont bijectives ? 4. Montrer que si ? ? ? est injective alors ? est injective. 5. Montrer que si ? ? ? est surjective ...







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Exercice 8: (Supplémentaire) On considère quatre ensembles A, B, C et D et des applications f: A?B, g: B? C, h: C? D. Montrer que: 1. (gof)injective f injective.
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