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

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-VxB) (Vx (AB)

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