I have at least one friend who, despite his extensive math abilities, adamantly refuses to accept this. Even when faced with the following proof.
1/9 = 0.111…
9*(1/9)= 9/9 = 1
9*0.111… = 0.999…
Therefore:
0.999… = 1
For more information on this, see any of the following:
Purplemath.com
Wikipedia.org
Jstor.org (academic [...]
