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OIL

OIL(Ontology Inference Layer or Ontology Interchange Language) can be regarded as an Ontology Infrastructure for the Semantic Web (see paper "OIL: An Ontology Infrastructure for the Semantic Web", IEEE INTELLIGENT SYSTEMS, MARCH/APRIL 2001). From an theoretic view, OIL is one the the latest Description Logic (DL).

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... roots of both sides yields <math>x+\frac{b}{2a}=\frac{\pm\sqrt{b^2-4ac}}{2a}.</math> Subtracting b/(2a) from both sides, w ...