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A comment on 0.999...= 1. Parent comment

Re:0.999...= 1 by michaelcampbell on Tuesday April 28, 2020 @12:54PM (#23008926)
Don't conflate "I don't understand it" with "hand-wavy". The 2 are different things.

Another proof by contradiction I've heard of this is that if 0.9... != 1.0... then there exists a number in between the 2. What is it?

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Re:0.999...= 1 by ubercow13 on Tuesday April 28, 2020 @01:07PM (#23009096)
It is hand-wavy, because it is using a vague conception of infinity which doesn't correspond to the real, useful definition of the infinity labelled "..."
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