Posted by **Ann** on Wednesday, April 2, 2008 at 7:47pm.

How would you construct a proof to show that the following arguments are valid?

1. TvH

2. T→G

3. ~H ֶG

1. ~~A

2. ~A v C ֶC

1. S • T

2. (S • T) → G

3. G →(H v B) ֶ H v B

1. A →B

2. C →D

3. A v C

4. ~D ֶ B

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