 (CC-Ord) neatly reflects Keynes’ (1921, 80) remark that “an argument is always as near to proving or disproving a proposition, as it is to disproving or proving its contradictory”. Indeed, quantitatively, the measure \(F(h, e\mid k)\) instantiates Confirmation Complementarity in a simple and elegant way, that is, it satisfies \(C_{P}(h, e\mid k) = -C_{P}(\neg h, e\mid k).\)