0.999...
In
mathematics, the
recurring decimal 0.999… , which is also written as or , denotes a
real number equal to
1. In other words, "0.999…" represents the same number as the symbol "1". The equality has long been accepted by professional mathematicians and taught in textbooks. Various
proofs of this identity have been formulated with varying
rigour, preferred development of the real numbers, background assumptions, historical context, and target audience.
See more at Wikipedia.org...
9 (number)
9
9 (nombre)
Développement décimal de l'unité
Exposants et indices Unicode
9
0,(9)
9 (liczba)
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9