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One more proof

 
 
Reply Wed 7 Dec, 2016 10:45 am
Sorry to post another one but this worksheet really confused me, there were 6 out of 30 that I just couldn't get...

1. R ⊃ A
2. A ≡ W
3. ∼A ∨ ∼W / ∼(W v R)
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Ding an Sich
 
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Reply Wed 7 Dec, 2016 09:15 pm
@agarry13,
agarry13 wrote:

Sorry to post another one but this worksheet really confused me, there were 6 out of 30 that I just couldn't get...

1. R ⊃ A
2. A ≡ W
3. ∼A ∨ ∼W / ∼(W v R)


Two hints: take advantage of the equivalence and break it down. Then take advantage of the third premise and use tautology.
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