Non-monotonic Reasoning

We have considered an extension of the language with an concept forming operator naf of non-provability. This operator can be applied to any concept term, but it can only occur on the left-hand side of terminological axioms. The resulting language is called .

Intuitively, an object a belongs to a concept naf(C) if we cannot prove that it belongs to C. In essence the implementation uses the negation as failure operator of PROLOG.

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