Discussion
Why must clause selection be fair in a saturating prover?
Answer: D
A heuristic that always prefers short clauses might postpone a long one indefinitely, losing completeness, so a fairness mechanism such as alternating with age is required. Memory, ordering and subsumption are separate concerns. That an aggressive heuristic can destroy completeness unless deliberately tempered is a lesson that applies to any priority driven search, and the remedy is always some form of guaranteed eventual selection.
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