“contraposition. In traditional logic the contrapositive of a proposition is obtained by negating both its terms and reversing their order. Thus ‘All rabbits are herbivores’ (‘All S are P’) becomes ‘Everything which isn’t a herbivore isn’t a rabbit’ (‘All non-P are non-S’).”
— Mr Colwyn Williamson ”contraposition” The Oxford Companion to Philosophy. Oxford University Press 2005. Oxford Reference Online. Oxford University Press. New York University. 3 March 2009 <http://www.oxfordreference.com/views/ENTRY.html?subview=Main&entry=t116.e505>
March 02, 2009
