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Predicate Symbols and Signatures

  • Predicate symbols represent relations between zero or more objects

  • The number of objects define a predicate‘s aritiy

  • Examples:

    • Likes(george, kate)

    • Likes(x,x)

    • Likes(joe, kate, susy)

    • Friends (father_of(david), father_of(andrew))

  • Signature: A signature is a collection of constants, function symbols and predicate symbols with specified arities

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