Discussion
What is the matching problem in a rule based system?
Answer: A
With thousands of rules and facts, testing every rule against every combination of facts after each change is prohibitive, and matching dominates the run time of such systems. Conflict resolution, which chooses among eligible rules, is the separate next step. Resolution pairing and unification are different operations. A step that appears to be bookkeeping and turns out to dominate the cost is worth identifying early, since optimising it is where the effort belongs.
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