Question: (12 marks) Use either the soundness or the completeness (Post's theorem) of the propositional logic to prove A(BC)taut(AB)(AC)A(BC)taut(AB)(AC). Which one did you use, soundness or

(12 marks) Use either the soundness or the completeness (Post's theorem) of the propositional logic to prove A(BC)taut(AB)(AC)A(BC)taut(AB)(AC). Which one did you use, soundness or completeness?

Hint: your cheat sheet could help.

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