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Crossword clue: unable for both to exist or be true at the same time

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Possible answers

contradictory 13 letters wn-def

two propositions are contradictories if both cannot be true (or both cannot be false) at the same time

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Related clues

propositions with the same terms, but opposed to each other both in quality and quantity.two propositions are contradictories if both cannot be true (or both cannot be false) at the same time