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Math Help - Labeling Equations

  1. #1
    Newbie
    Joined
    Nov 2008
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    United Kingdom
    Posts
    13

    Labeling Equations

    Hi all,

    May I get help in how to label system of equations?
    I usually use the following
    \begin{equation}\label{eqn:TW}
    \begin{split}
    u_{t}& =u_{xx}+f(u,v),\\
    v_{t}& =g(u,v),
    \end{split}
    \end{equation}

    I would like here to get a lebel but not number as usual I want it something different. For example, instead of getting (1) I would like to get (TW) as a lebel.

    Any help will be greatly appreciated.

    Thank you in advance.
    RainyCloud
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  2. #2
    Newbie
    Joined
    Nov 2008
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    United Kingdom
    Posts
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    Is there any special package should be used?
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  3. #3
    Newbie
    Joined
    May 2009
    Posts
    23

    equation tags

    Hi RainyCloud,

    because there was no answer to your question perhaps it's still useful for you: the \tag command of amsmath does what you were looking for. With your example:
    Code:
    \begin{equation}\label{eqn:TW}
    \begin{split}
    u_{t}& =u_{xx}+f(u,v),\\
    v_{t}& =g(u,v),
    \end{split}\tag{RW}
    \end{equation}
    You don't need an additional package because you're already using amsmath. There's a starred version \tag* that's not using parentheses by default.

    Stefan
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