Question: 9. Let A be a formula such that x does not appear free in A. Assuming (A- VxB),AH B, prove that (A -VrB) (Vx (A-

9. Let A be a formula such that x does not

9. Let A be a formula such that x does not appear free in A. Assuming (A- VxB),AH B, prove that (A -VrB) (Vx (A- B) 9. Let A be a formula such that x does not appear free in A. Assuming (A- VxB),AH B, prove that (A -VrB) (Vx (A- B)

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