Negative Databases link
http://www.economist.com/science/PrinterFriendly.cfm?story_id=7854216
In the 1940s a philosopher called Carl Hempel showed that by manipulating the logical statement "all ravens are black", you could derive the equivalent "all non-black objects are non-ravens". Such topsy-turvy transformations might seem reason enough to keep philosophers locked up safely on university campuses, where they cannot do too much damage. However, a number of computer... Visit Link →

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