Answer Happy

Use De Morgan's law for quantified statements and the laws of propositional logic to show the following equivalences: (a) Vx (P(x) A-Q(x)) = 3x (-P(x) V Q(x)) (b) p q (c) 3 (-P(x) V (Q(x) A-R(x))) = Va (P(x)^(-Q(x) V R(x)))|