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Homework Help: Clopen set

  1. Nov 3, 2007 #1
    So, I know that R and null are clopen, but now to prove they are the only clopen subsets of R... without the idea of boundary points? I know how to do it with boundary points, but can it be done without?
  2. jcsd
  3. Nov 3, 2007 #2


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    Show that R is connected.
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