SOLUTION: please help me solve: 1.D v (S & I) 2.D>S :. S

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Question 1071952: please help me solve: 1.D v (S & I)
2.D>S :. S
Answer by Edwin McCravy(20056)   (Show Source): You can put this solution on YOUR website!

The word is "prove", not "solve"

1. D v (S & I)
2. D > S         :. S

       |3. ~S      Assumption for Indirect Proof
       |4. ~D      2,3, Modus Tollens
       |5. S & I   1,4, Disjunctive Syllogism    
       |6. S       5, Simplification 
       |7. S & ~S  6,3, Conjunction

8. S    3-7 Indirect Proof



Edwin
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