In calculus, sequences such as a1=1/1,a2=1/2,a3=1/3..... are discussed. However, most mathematicians and the majority of the mathematical laity prefer the notation an=1/n (n≥1) for the sequence above. Often, the limit of a sequence is discussed. A sequence a is said to converge to a limit L if a becomes arbitrarily close to L and stays there. For the case of 0.9999..., the sequence would be an=1-10-n,where n is the number of 9's after the decimal point. For infinitely continuing digits, as n→∞, an=1-10-∞, thus proving that 0.999999999... until infinity tends to 1.