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Math Help - sup proving question..

  1. #1
    MHF Contributor
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    sup proving question..

    i added the question in the link:
    http://img388.imageshack.us/img388/2220/57946210jf5.gif
    this is a total abstract thing
    i dont know how to prove SUP whithout a formula to the series

    i need to prove that S is the least upper bound
    i dont know how to do that. i can say that
    there is a cetain "e"
    that if we subtract it from S we will get a member from A which is larger then S.
    but is it a proof??
    and what the -> thing means in the end ??
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  2. #2
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