Why, how do you do?

[Tiberius]

The ability to write out infinitely long numbers is irrelevant if you (a) have an understanding of the word "infinity" and (b) have a notation system for such concepts. 1.999... means quite literally "1.999 with an infinite amount of repeating 9's".

I don't claim to have a supernatural authority...and I'm quite confused as to why you've brought it up.

Please go and re-read the thread if you want proofs.