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Can anyone construct a formal proof for this argument using an equivalence

 
 
Reply Mon 14 Dec, 2015 08:59 pm
r V ( m → n )
~ s Λ ~ r
~ ( d V n )
___________
~ m
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wendyluv143
 
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Reply Tue 15 Dec, 2015 02:43 pm
@ArianaMaria,
Statement Reason
1. ~ s Λ ~ r - premise
2.~r -C.S. (1)
3. r V ( m → n ) -premise
4.m → n -D.S. (2,3)
5. ~ ( d V n ) -premise
6.~m Λ~n -con. Neg. (4)
7.~ m -C.S. (6)
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