Plural form of contrapositive; multiple statements that have been formed by reversing and negating the parts of conditional propositions.
English plural of 'contrapositive,' formed by adding '-s.' The singular term entered English philosophical vocabulary in the 18th-19th centuries.
When mathematicians work with contrapositives, they're using a tool so elegant that it appears across fields—from medicine (if the test isn't positive, you don't have the disease) to everyday reasoning!
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