reasoning forward from "NOT A." If A is still provable in the updated
database, then the update, which only deletes the explicit occurrence of A,
does not alter the logical content of the database, and there is, therefore, no
need to consider the update as a top clause for integrity checking.
Because of the possible presence of negation by failure in the deductive
rules,
deletion of facts can implicitly add new facts to the database. Using the
extended resolution rule t ...
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