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Analysis problem

  1. Sep 7, 2006 #1
    Please help!
    Here is a homework question that I need help starting!
    It is a fact that the squares of the rational numbers are dense in the positive rational numbers, that is, for any r1,r2 in Q with 0< r1< r2, there exists p in Q with r1< p2<r2. Let β be a cut such that 0*< β. Let α be the subset of Q defined by α={p in Q: p< or =0 or p2 in β}. Use the abovementioned density of the squares of rationals to show that α is a cut and that αα=β.

    ps How do I put mathematical notation here????

    Any foresight you can give would be greatly appreciated!
  2. jcsd
  3. Sep 7, 2006 #2


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    Homework Helper

    The usual questions: what have you tried, where are you stuck, what are the definitions, etc?
  4. Sep 10, 2006 #3
    I am having a little trouble interpreting the question. By p2, do you mean p squared?


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