The lifting lemma is a principle in logic that helps to maintain the validity of a set of clauses when transitioning from a propositional logic setting to first-order logic. This lemma is significant as it allows for the extension of resolution techniques, ensuring that if a propositional resolution refutation exists, one can derive a first-order resolution refutation by lifting the clauses involved.
congrats on reading the definition of Lifting Lemma. now let's actually learn it.