 As an aside, and as mentioned above, there is an often-remarked upon duality between truth-value gaps and truth-value gluts (Parsons 1990). And yet, it is perhaps worth noting that in Metaphysics \(\Gamma\) (Chapter 7) Aristotle also defends the dual of the LNC, the Law of Excluded Middle, LEM, particularly in the version which has nowadays been distinguished as the Law of Bivalence: for any \(A\), it is necessary for (at least) one of \(A\) and \(\neg A\) to be true. But the LEM has often had a less secure place in Western Philosophy than the LNC, in spite of the numerous obvious dualities between the two principles. Aristotle himself, at least according to one interpretation, appears to attack the Law in De Interpretatione, Chapter 9, when he comes to the famous subject of  future contingents.