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The Probert Encyclopaedia of General Information

CONVERSION

Conversion is a term in logic. A proposition is converted when the predicate is put in the place of the subject, and the subject in place of the predicate; as, 'no A is B' ('no virtuous man is a rebel'), the converse of which is 'no B is A' ('no rebel is a virtuous man'). Simple conversion, however, in this manner is not always logical. In the case of universal affirmatives, for example, 'all A are B' (say, 'all men are animals'), the simple converse ' all B are A' ('all animals are men') would not be true.
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