One of the mysteries of the English language finally explained.
Conversion of a proposition from all A is B to all not-B is not-A.
- ‘By contraposition and the definition of the existential quantifier, the latter axiom is equivalent to x = x y (y = x).’
- ‘As a contraposition to the conclusions derived from the summation theorem, we have used similar mathematical tools to show that dominance is not an inevitable property of metabolic pathways.’
- ‘This means that form and content are not fully unified but retain a structure of abstract contraposition: the content is inscribed in the form while retaining much that cannot be grasped in it.’
Mid 16th century: from late Latin contrapositio(n-), from the verb contraponere, from contra- ‘against’ + ponere ‘to place’.
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