Boolean Extensions

• Fuzzy Logic

  • Adds weights to each term/concept
  • ta AND tb is interpreted as MIN(w(ta),w(tb))
  • ta OR tb is interpreted as MAX (w(ta),w(tb))

• Proximity/Adjacency operators

  • Interpreted as additional constraints on Boolean AND

• TOPIC system

  • Uses various weighted forms of Boolean logic and proximity information in calculating RSVs

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