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Math Help - calling an equation..

  1. #1
    MHF Contributor kalagota's Avatar
    Joined
    Oct 2007
    From
    Taguig City, Philippines
    Posts
    1,026

    Exclamation calling an equation..

    suppose i have this command..

    \begin{equation} blahbah \end{equation}

    If blah, then heh..

    \begin{equation} blahbahblah \end{equation}

    the two equations will be labeled then.. my problem is, how would i call the equation if i am going to use it somewhere..

    for example, "using equation ?, we get..."

    i can do it manually, but suppose i have lots of equations? generally, one wouldn't and not advisable to count for the equation label,,

    got my problem?

    thanks for your help guys!!
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  2. #2
    Super Member flyingsquirrel's Avatar
    Joined
    Apr 2008
    Posts
    802
    Hello, kalagota

    Use \label{} and \ref{} :

    Code:
    \begin{equation}
       x=y 
       \label{name-of-this-equation}
    \end{equation}
    
    From equation \ref{name-of-this-equation} we have...
    \ref{name-of-this-equation} prints the number of the equation labelled "name-of-this-equation". In case you don't know it : you must compile twice your document when you use \label{} and \ref{}.

    Another possibility is to use the command \eqref{} (from the package amsmath) instead of \ref{}. \eqref{} puts labels of equations between parenthesis, \ref{} doesn't.
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  3. #3
    MHF Contributor kalagota's Avatar
    Joined
    Oct 2007
    From
    Taguig City, Philippines
    Posts
    1,026
    thanks bro!
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