Thread: Concept of Quantity

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  1. #1
    Registered User C_ntua's Avatar
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    Quote Originally Posted by EVOEx View Post
    But at the very least, even if you take another definition, to me this seems to prove that there is no number between "0.9999..." and 1: if there were, the limit there would be less than 1!
    And one can always find a number between two numbers that aren't equal: their average, for example.
    Going on this logic, as said in an earlier post, then you have to consider that
    Code:
    lim(x->inf)(9*10^-x) = 0
    so you are not getting closer and closer since you will be adding zero. True?
    In other words the difference will always be "0.00..001". The more 9s you add the more 0s you can add and you are always on the same point.
    And the logic you are getting closer and closer is controversial to infinity. If you have infinite space, will you ever reach the end? That is the point, you would never reach the end.
    Even worse, if you can reach 1, then if you add another 9s what happens? If you add another and another? Makes no real sense.
    Wouldn't you agree that if there is no limit then it will grow bigger and bigger? If there is a limit that would be one, but by definition it will never reach it.

  2. #2
    Lurking whiteflags's Avatar
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    The whole point is you don't even reach the end of infinity. The whole point of saying anything like "endless nines" is that "Look to the nth place, and there will be a nine there." Furthermore, any real number between 0.999... and 1 would be too big.

    You can't really take the difference: 1.000000... - 0.999999... = 0.000000...

    You can write that last 1 when you finish writing zero to infinite places, but you will never finish, will you? What's the point of arguing all the rigorous testing done by wolfram? It just seems silly that the only number people can think of between 0.999... and 1 is some number with even more nines. But for any number you can think of, it's part of 0.999... to begin with.

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