To place side by side for comparison; to contrast or place in opposition; in logic, to contrapose means to form a contrapositive statement.
From French 'contraposer,' combining 'contra' (against/opposite) and 'poser' (to place or pose). Related to the artistic term 'contrapposto,' which means balanced opposition of body parts.
In logic, contraposing a statement is mathematically brilliant—'If A then B' is logically identical to 'If not B then not A,' which lets mathematicians prove things by proving their opposites.
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