The proof establishes ‘ 1+1 = 2 ’ as an item of mathematical knowledge or truth, according to the previous analysis, since the deductive proof provides a legitimate warrant for asserting the statement. Furthermore it is a priori knowledge, since it is asserted on the basis of reason alone.
However , what has not been made clear are the grounds for the assumptions made in the proof .The assumptions made are of two types : mathematical and logical assumptions .The mathematical assumptions used are the definition (D1 and D2) and the axioms (A1 and A2) .The logical assumptions are the rules of inference used