Hi there
I was reading through this webpage:
Arithmetic Rules and I got to the author's attempt to prove the statement
where
.
I am, however, not convinced by his argument.
Up to this point he had estabished the following to be true:








He gives as a proof:
Am I correct in thinking that
should be in parentheses when
is added to it, and since the author is yet to establish that
the proof is invalid?
Would anyone be able to tell me whether or not I am correct in thinking this, and if not then explain what I am not understanding?