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Sigma KEE - LogicalOperator
KB Term: 
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logical operator
This Class comprises all of the logical operators (viz. 'and', 'or', 'not', '=>', and '<=>').
Relationships      
Parents predicate A Predicate is a sentence-forming Relation. Each tuple in the Relation is a finite, ordered sequence of objects. The fact that a particular tuple is an element of a Predicate is denoted by '(*predicate* arg_1 arg_2 .. arg_n)', where the arg_i are the objects so related. In the case of BinaryPredicates, the fact can be read as `arg_1 is *predicate* arg_2' or `a *predicate* of arg_1 is arg_2'.


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