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Determining which sets are open?

  1. Sep 26, 2009 #1
    (1/2,1/3),[1/2,1],[0,1/2]

    which are open in the subspace topology of the subspace [0,1] of the lower limit topology on R
     
  2. jcsd
  3. Sep 27, 2009 #2

    HallsofIvy

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    Use the definition! Which of those is the intersection of [0, 1] with a set open in R (using the lower limit topology, of course)?
     
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