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Re: .999~ = 1
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Originally Posted by deltacoder1020
squaring is not a 1 to 1 operation, thus you cannot do the proof backwards, and thus it is not valid.
x^2 = y^2 --/--> x = y
(x squared = y squared) does not imply (x = y)
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at least someone found the correct reason for it being incorrect 
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You can't get the square root of 1 equal to -1 so it fails.
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What is the sqrt of 1?
Consider that if you square -1 you get 1 and so the sqrt of 1 is -1 or 1
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