Question: Line 5 is justified using Lines 1 - 4, which is what we would expect. But given what is actually on Line 4 it has

Line 5 is justified using Lines 1 - 4, which is what we would expect. But given what is actually on Line 4 it has been applied incorrectly. Based on the line you identified in the previous question, which rule needs to be used in this proof before line 5 in order to avoid that particular mistake? (-A A) |- A 1 (1) (-A A) A Aim: A 2 (2) -A A/IP |- 1,2 (3) A 1,2 MP 1,2 (4) (A & -A) 2,3 &I 1,2 (5) A 2-4 IP

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