Wikipedia's today featured article. In mathematics, 0.999… (also denoted 
or 
) is a recurring decimal exactly equal to 1. In other words, the symbols '0.999…' and '1' represent the same real number. Mathematicians have formulated a number of proofs of this identity, which vary as to their level of rigor, preferred development of the real numbers, background assumptions, historical context, and target audience.
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