For those as smart as Devonin, or those who think they are, prove yourselves!

[Cerulean Angel]

So, I went to my AP physics class today and the teacher asked us a question, and he wanted our answer to be JUSTIFIED by us with specific evidence, here was the question:

Does 1 = .999...(repeating), literally as it is

I and two other people got this right out of thirty, so I want to see how many here can get it right, ready, go!

EDIT: The underscore didn't go in the right place so I had to fix it, it's .999...forever