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I don't have all the info, but I know that Post discovered that a functionally complete set of logical connectives has one member that does not possess one of five qualities for each of the five qualities. The qualities are: self-dual, monotonicity, linear, truth-preserving, falsehood-preserving. It is sometimes called adequacy of logical operators, Post functional completeness, or truth functional completeness. Gregbard02:29, 8 July 2007 (UTC)[reply]
