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FORMAL LOGIC Computer Science School of Computing 1.1 Prove that the following propositional formula is unsatisfiable by means of a semantic argument, i.e. by arguing

FORMAL LOGIC

Computer Science School of Computing

1.1 Prove that the following propositional formula is unsatisfiable by means of a semantic argument, i.e. by arguing directly from the definitions of operators and formulas, their truth and satisfiability: (p(qr))((pq)(pr)) 1.2 Use a semantic tableau to prove that the following propositional formula is valid. (pq)((pr)(qr))

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