CONTRAPOSITIVE Definition & Meaning

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contrapositive

[ kon-truh-poz-i-tiv ]

Phonetic (Standard)IPA

adjective

of or relating to contraposition.

noun

a contrapositive statement of a proposition.

contrapositive

/ ˌ��ɒ�Գٰ�əˈ��ɒ��ɪ��ɪ�� /

adjective

placed opposite or against

noun

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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51�Թ� History and Origins

Origin of contrapositive¹

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

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Example Sentences

Examples have not been reviewed.

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

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

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But take the obverse of the contrapositive of both premises: All m is p; All m is s: ∴ Some s is p.

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We will show in this manner that the above is really the contrapositive of the 0 proposition.

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Every impression felt is felt as a change or transition from something else: but it is a variation of the same impression—the something else, the contrapositive, is not entirely different.

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