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I can not understand a paragraph in a book(about inequality)

  1. Sep 17, 2009 #1
    http://bildr.no/thumb/489513.jpeg
    489514.png
    489526.png
    489516.png
    4 pics are continual .
    I can not understand the lines denoted by red line.

    thanks
     
  2. jcsd
  3. Sep 17, 2009 #2
    I have understood it .
     
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