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Symbolic Logic: prove the following sequent is valid in PL: USE CP (CONDITIONAL PROOF) AND/OR Ev (DISJUNCTION ELIMINATION) Q -> R: (PvQ) -> (PvR) 1.

Symbolic Logic: prove the following sequent is valid in PL:

USE CP (CONDITIONAL PROOF) AND/OR Ev (DISJUNCTION ELIMINATION)

Q -> R: (PvQ) -> (PvR)

1. Q->R /Premise

2. PvQ /A for CP

3. P /A for Ev

4. PvR /Iv, 3

5. Q /A for Ev

6.

7.

8.

9. (PvQ) -> (PvR)

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