Three-Valued Logic


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About the Paper

Much has been written and debated about the use of SQL NULLs to represent unknown values, and the possible use of three-valued logic.  However, there has never been a systematic application of any three-valued logic to use in the logical expressions of computer programs.  This paper lays the foundation for a systematic application of three-valued logic to one of the two problems inadequately addressed by SQL NULLs.

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