0.999...
 In mathematics, the repeatin decimal 0.999... (sometimes written wi mair or fewer 9s afore the final ellipsis, or as 0.9, 0.(9), or ) denotes a real nummer that can be shawn tae be the nummer ane. In ither wirds, the seembols "0.999..." an "1" represent the same nummer. Pruifs o this equality hae been formulatit wi varying degrees o mathematical rigor, takin intae accoont preferred development o the real nummers, backgrund assumptions, historical context, an target audience.
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