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

Line 5 is justified using Lines 1 - 4, which is what we would expect. But given what is actually on Lines 1 - 4, IP has been applied incorrectly. Which of those lines is the problem? Which line's wff makes IP incorrect on Line 5? 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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