The contrapositive statement formed by switching and negating the parts of a logical proposition.
Medieval Latin 'contrapositus,' past participle of 'contraponere,' literally meaning 'placed against.' The term was formalized in scholastic logic during the 13th century.
Mathematicians love this because proving the contrapositive is often easier than proving the original statement, yet it's logically equivalent—it's like solving a puzzle by approaching it backward!
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