What does this notation mean?

  1. Jan 13, 2014 #1

    I want to do a problem with this but i can't find anything about it, if anyone can help me it'd be very useful, thank you. :)

    The one i want to do exactly is [20;30[ , in case anyone is wondering.
  2. jcsd
  3. Jan 13, 2014 #2


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    Science Advisor

    Google says...


    The endpoint of an open interval can be expressed with an outward-facing square bracket which is synonymous with an inward-facing parenthesis.
  4. Jan 13, 2014 #3


    Staff: Mentor

    In other words, [20;30[ means {x | 20 ≤ x < 30}, the interval on the real number line between 20 and 30, with 20 included and 30 excluded.
  5. Jan 14, 2014 #4


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    Staff Emeritus
    Science Advisor

    Perhaps you are familiar with [20, 30), another notation meaning the same thing- all numbers between 20 and 30, including 20 but not 30.
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