Logical nor is a boolean logic operator which produces a result that is the inverse of logical or. That is, p nor q is only true when both p and q are false, and is false otherwise.
Nor has the interesting feature that all other logical operators can be expressed by various functions of nor. This is similar to the logical nand operator.
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... the term was already doccumented as in use in the United Kingdom as early as 1912.
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