Question: 2. (a) Explain why the following holds: if U is a finite set of propositional formulas then U - A if and only if U

2. (a) Explain why the following holds: if U is a finite set of propositional formulas then U - A if and only if U U {-A} is unsatisfiable . (b) Using resolution, show that (p-q,q-r,r-p.pvqVr} paqAr

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