26 lines
869 B
Text
26 lines
869 B
Text
import .clause .prover_state
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open expr list monad
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namespace super
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meta def is_taut (c : clause) : tactic bool := do
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qf ← c^.open_constn c↣num_quants,
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return $ list.bor $ do
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l1 ← qf^.1^.get_lits, guard l1^.is_neg,
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l2 ← qf^.1^.get_lits, guard l2^.is_pos,
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[decidable.to_bool $ l1^.formula = l2^.formula]
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meta def tautology_removal_pre : prover unit :=
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preprocessing_rule $ λnew, filter (λc, lift bnot $♯ is_taut c↣c) new
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meta def remove_duplicates : list derived_clause → list derived_clause
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| [] := []
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| (c :: cs) :=
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let (same_type, other_type) := partition (λc' : derived_clause, c'↣c↣type = c↣c↣type) cs in
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{ c with sc := foldl score.min c↣sc (same_type↣for $ λc, c↣sc) } :: remove_duplicates other_type
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meta def remove_duplicates_pre : prover unit :=
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preprocessing_rule $ λnew,
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return $ remove_duplicates new
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end super
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