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Simplify ProofRule::SKOLEMIZE (cvc5#10898)
Changes: - ProofRule::SKOLEMIZE only expects negated universals as premises. - Skolems of id `QUANTIFIERS_SKOLEMIZE` take a universal instead of an existential. After doing this change, several BV invertibility condition benchmarks became "unknown", since the witness term elimination introduced in cvc5#10848 was not quite optimal: in particular, the skolems introduced when eliminating witness for BV invertibility condition instantiations would in rare cases not align with the quantified formulas since we did not run theory preprocessing on them. This fixes the issue by making the witness elimination take this into account via a new callback in this utility. --------- Co-authored-by: Abdalrhman Mohamed <[email protected]>
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