Oppositional concepts: alternative facts

The value of retaining and exploring oppositional concepts is discussed in books like Oppositional Concepts in Computational Intelligence, Tizhoosh and Ventresca, Springer, 2008. See also my blogs of 30 January 2017 and 5 July 2016. Oppositional concept pairs can be taken to be examples of legitimate alternative facts.  (In physics an especially important example might be the fact that a photon is a wave and the fact that a photon is a particle. Again, however, I do not wish to legitimize examples which are simply outright lying.) My artificial intelligence Asa H has made use of oppositional concepts.