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Philosophy - HELP

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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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