contraposition definition

  • noun:
    • An opposite place; antithesis.
    • The statement associated with the form "if perhaps not Q then perhaps not P", because of the statement "if P then Q".
    • A placing over against; reverse position.
    • A so-called instant inference which consists in denying the original subject for the contradictory predicate; e. g.: Every S is P; therefore, no Not-P is S.
    • A placing over against; opposite place; in reasoning, the mode of inference which continues by transposing subject and predicate, antecedent and consequent, or idea and conclusion, with negation of transposed parts.

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