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Contingent :Non nécessaire. Est contingent ce qui pourrait être différent, ce qui, dit Aristote, pourrait être ou ne pas être sous quelque rapport que ce soit. Quelque chose est contingent quand son contraire est possible.Nécessaire :Caractère de ce qui ne peut pas être autrement. Ce dont le contraire est impossible. On distingue la nécessité logique (ce qui découle des seules règles du raisonnement valide) et la nécessité physique (ce qui découle d'une loi de la nature dûment vérifiée expérimentalement).Possible :1) Est possible logiquement: ce qui n'implique pas de contradiction, donc est compatible avec les règles de la logique.2) Est possible objectivement: ce qui n'est pas en contradiction avec les lois naturelles.

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