Question: Here is a proposed proof for the (A = A) = A in H. 1. {A} A = ((A = A) = A) Axiom 1
Here is a proposed proof for the (A = A) = A in H. 1. {A} A = ((A = A) = A) Axiom 1 2. {A} A Assumption 3. {A} ((A = A) = A) MP 1,2 4. A = ((A = A) = A)) Deduction 3 5. (A = A) = A MP 2,4 Is this a valid proof? If not, indicate the line(s) that are invalid and explain why they are not correct. 2
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