Question: Plzz solve . Question 9. (10=5+5 points) (a) Show that (Vx) (A - B) I (3x) A -> B, provided x does not appear free

Plzz solve .

Question 9. (10=5+5 points) (a) Show that (Vx) (A - B) I (3x) A -> B, provided x does not appear free in B. (b) Suppose f is a unary function symbol and c is a constant symbol. Prove that +x = y -+ f (x) = c= f(y) =c

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