17 lines
496 B
Text
17 lines
496 B
Text
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rewrite_set NNF
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add_rewrite not_not_eq not_true not_false not_neq not_and not_or not_iff not_implies not_forall
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not_exists forall_and_distribute exists_and_distributer exists_and_distributel : NNF
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variable p : Nat → Nat → Bool
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variable f : Nat → Nat
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variable g : Nat → Nat → Nat
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(*
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local t1 = parse_lean('¬ ∀ x, (∃ y, p x y ∨ p (f x) (f y)) ∨ f 0 = 1')
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local t2, pr = simplify(t1, "NNF")
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print(t1)
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print("====>")
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print(t2)
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get_environment():type_check(pr)
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*)
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