Reason Maintenance

Reason Maintenance or Truth Maintenance is a technique for maintaining a propositional database that has a Retract operation. We assume that the database has three operations:

We assume that the database does forward inference from assertions, so that if P and P &rarr Q have been asserted, Q will also be asserted.

For efficiency, the database may be indexed for fast lookup on predicates and ground terms as arguments of the predicates.

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