Given a data base of facts (ground instances) and rules expressed in logic, we can pose questions in logic and answer them using resolution.
Consider the question, ``Who is a grandparent of Harmonia?'' This can be expressed as &exist x Grandparent(x, Harmonia) ; this is negated to be &forall x ¬ Grandparent(x, Harmonia) (``Nobody is the grandparent of Harmonia.'').
We then can use resolution to derive □, thus proving that Harmonia does have a grandparent. But who is it?
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