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Si et seulement si<br />

Deux méthodes :<br />

1. Chaînage de si et seulement si<br />

P ⇔ R, R ⇔ Q<br />

P ⇔ Q<br />

2. Preuve des implications dans les deux sens<br />

P ⇒ Q, Q ⇒ P<br />

P ⇔ Q<br />

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