Contrapositive definition

kŏntrə-pŏzĭ-tĭv
A proposition derived by negating and permuting the terms of another, equivalent proposition; for example, All not-Y is not-X is the contrapositive of All X is Y.
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(logic) A proposition obtained by negating and transposing the terms of a given proposition.

The contrapositive of “All A is B” is “All not-B is not-A”

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(logic) The inverse of the converse of a given proposition.
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