View synonyms for contrapositive

contrapositive

[ kon-truh-poz-i-tiv ]

Phonetic (Standard)IPA

adjective

contrapositive

/ ˌkɒntrəˈpɒzɪtɪv /

logic
1. a conditional statement derived from another by negating and interchanging antecedent and consequent
2. a categorial proposition obtained from another, esp validly, by any of a number of operations including negation, transferring the terms, changing their quality, and also possibly weakening from universal to particular

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First recorded in 1855–60; contraposit(ion) + -ive

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There is an apparent exception to this when the real Middle in an argument is a contrapositive term, not-M.

In the case of the I proposition the contrapositive is impossible, as infringing the main rule of conversion.

For a Disjunctive in I., of course, there is no Contrapositive.

Every positive in thought has a contrapositive, and the positive and contrapositive are of the same kind.

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