Sunday, 11 July 2021

A Concise Introduction to Logic, Patrick J. Hurley, Wadsworth, 2006, 9th ed,. 7.7, 17, p. 390

 Prove the logical truth.

 

1.     P

2.     • ~ Q

3.     Q

4.     Q v R

5.     ~ Q • Q

6.     ~ Q

7.     R

8.     (Q • ~ Q) ⊃ R

9.     ⊃ [(Q • ~ Q) ⊃ R]

/ P ⊃ [(Q • ~ Q) ⊃ R]

ACP

ACP

2 Simp

3 Add

2 Com

5 Simp

4,6 DS

2-7 CP

1-8 CP

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