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Blech. These are the grossest words.

negation by failure

negation by failure in Technology

An extralogical feature of Prolog and other logic programming languages in which failure of unification is treated as establishing the negation of a relation. For example, if Ronald Reagan is not in our database and we asked if he was an American, Prolog would answer "no".

The Free On-line Dictionary of Computing, © Denis Howe 2010
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