Quote Originally Posted by Arche
That's what algebraic proofs are for

1.8 != 2 however, no matter how you look at it. It's a result of adding the 0.6's incorrectly. 1.8 is 1 + 8/9, which you can clearly see is not 2, so you must have assumed or done something wrong in your previous addition.
Which is why using the 0.3's and 1/3's approach for 0.9 =1 is not an accepted proof.

I didn't say that it proves that 1.9 != 2, I just said that it's a simplistic way is displaying it, much like the 0.3's and 1/3's proof, although neither are accepted proofs.