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Domain and range

  1. Mar 3, 2008 #1
    1. The problem statement, all variables and given/known data
    I don't really know how to ask this, so I'll get straight into an example.

    x:x[tex]\in[/tex](-[tex]\infty[/tex],[tex]\infty[/tex]) but x[tex]\neq[/tex]1
    x:x[tex]\in[/tex](-[tex]\infty[/tex],1)[tex]\cup[/tex](1,[tex]\infty[/tex])

    what is the difference between these two intervals?


    2. Relevant equations



    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Mar 3, 2008 #2

    Dick

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    Science Advisor
    Homework Helper

    There is no difference. They are both the whole real line except for x=1. Why do you ask?
     
  4. Mar 3, 2008 #3
    At times when I look at answers in the back of the book, it is one or the other. There didn't appear to be any consistency, so I was wondering if I was possibly missing something..
     
  5. Mar 4, 2008 #4

    HallsofIvy

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    Staff Emeritus
    Science Advisor

    Yes, you are missing seeing that they are the same thing!
     
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