Discussion
What is factoring in resolution?
Answer: D
If two literals within one clause can be made identical, the clause may be replaced by its factor, and without this step resolution is not complete. It is easily overlooked because it never arises in the propositional case. Splitting, common factors and subsumption are different operations. A step required only in the lifted version of a rule, and invisible in the propositional one, is exactly the kind of detail that makes a first implementation subtly incomplete.
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