13 lines
718 B
Text
13 lines
718 B
Text
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-- Basic (propositional) forward chaining with clauses
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constants (A B C D E : Prop)
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definition lemma1 : A → (A ∨ B → C) → C := by blast
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definition lemma2 : B → (A ∨ B → C) → C := by blast
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definition lemma3 : A → B → (A → B ∨ C → D) → D := by blast
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definition lemma4 : A → B → (A → B ∨ C ∨ C → D) → D := by blast
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definition lemma5 : A → B → (E ∨ A ∨ E → E ∨ B ∨ C ∨ C → D) → D := by blast
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definition lemma6 : A → (A → B → C) → ¬ C → ¬ B := by blast
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definition lemma7 : ¬ D → B → (A → E ∨ B ∨ C ∨ C → D) → ¬ A := by blast
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definition lemma8 : ¬ D → B → (A ∨ E → E ∨ B ∨ C ∨ C → D) → ¬ (A ∨ E) := by blast
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