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Math Help - What does this symbol mean?

  1. #1
    Newbie
    Joined
    Feb 2009
    Posts
    1

    What does this symbol mean?

    Hi,

    Could you people help me a little? I Donít understand what this symbol means. Itís that weird vertical line at the right side of the equation.
    http://upload.wikimedia.org/math/f/f/8/ff889b88812e30f9aa85a97950a613a2.png
    What does the line and that ďT=0Ē mean? I have never seen that before, and now Iím stuck! I canít study more before I know what that line means.
    So If you guys could help me a little I would greatly appreciate it
    Thanks.
    (PS. My English might be a little weird because itís not my native language. But try to understand what Iím trying to say )
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  2. #2
    Junior Member
    Joined
    Oct 2008
    Posts
    39
    it means to evaluate the equation at that value for the given variable...so in your case evaluate at T=0
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