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Re:0.999...= 1 by saagarjha on Tuesday April 28, 2020 @04:38AM (#23004973)
I don’t think this reasoning is correct, because the limit of an expression does not have to be the same as the value at the point the limit is being taken. For example, if your sequence is “sin(1/x) * x“, then it’ll slowly appear to converge to one as x approaches infinity, but it cannot reach it. So there’s really no relevant conclusion you can make.
Re:0.999...= 1 by ltbarcly3 on Tuesday April 28, 2020 @09:19PM (#23014208)
You're taking a map from R -> R, I'm taking a sequence of discrete values. It's not the same thing.

However, I was a bit fast and loose, the sequence .9, .99, .999, .9999 also gets closer and closer to 2 but it doesn't converge to 2, I should have said if you have a metric || and some number X such that for any d, there exists an N such that |X -An| < d for all n > N, then the sequence A converges to X. But I wasn't trying to write a proof.

https://en.wikipedia.org/wiki/(%CE%B5,_%CE%B4)-definition_of...