Using rules from both Group I and Group II, construct a deduction to prove that the following is valid.1. P ? ~(M & R) (Premise)2. ~P ? Q (Premise)/? ~Q ? (~M v ~R)
What will be an ideal response?
This item shows the advantage of the deductive method for proving validity over even the short truth-table method. Only a modest familiarity with CA and IMPL should enable you to do this problem in your head.
3. ~Q ? P 2, CONTR
4. ~Q ? ~(M & R) 3,1, CA
5. ~Q ? (~M v ~R) 4, DEM
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