Discussion
What does the resolution rule do?
Answer: C
Resolution takes two clauses, one containing a literal and the other its negation, and produces the clause containing everything else from both. That single rule is complete for refutation, which is its remarkable property. Ambiguity, normalisation and conclusion selection are different notions. A single rule sufficing for a whole logic, in place of a dozen natural deduction rules, is what makes mechanical proof search feasible.
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