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05-12-2010, 12:44 PM
You can easily define a math where the infinitesimal exists, and consequently show that .999... doesn't equal 1. Proof of nonexistence is only valid within the relevant universe of discourse, and it is unfortunate that you went through a proof without defining its limitations.
My own opinion on the matter is that if your math contains pi, 0.999... doesn't equal 1.
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