contraposition - WordReference.com Dictionary of English

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contraposition

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Concise Oxford English Dictionary © 2008 Oxford University Press:
contraposition/kɒntrəpəˈzɪʃ(ə)n/

▶noun Logic conversion of a proposition from all A is B to all not-B is not-A.

– derivatives
contrapositive adjective & noun.

– origin C16: from late L. contrapositio(n-), from contraponere ‘place against’.

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