Discussion
Why is implication eliminated during conversion to clausal form?
Answer: B
A clause is a disjunction of literals, so every connective must first be rewritten in terms of negation, conjunction and disjunction, and the implication rewrite is the first step. Implication is perfectly truth functional and may be nested freely, and the rewrite generally leaves the size unchanged. Reducing a rich syntax to a minimal one, so that a single inference rule suffices, is the purpose of the whole conversion.
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