Question about the intervals (b,b) and [b,b]

  1. Let b be a real number. Correct me if I'm wrong, but it seems that:

    (1) The interval (b,b) is empty, as are the intervals (b,b] and [b,b).
    (2) The interval [b,b] consists of a single point (namely, b).
  2. jcsd
  3. Hurkyl

    Hurkyl 15,987
    Staff Emeritus
    Science Advisor
    Gold Member

    These statements look correct to me.
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