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Latex equations inside a box

  1. Jan 13, 2008 #1

    kdv

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    I am not sure if this is the right place to post a Latex question. If not, tell me where I should go.

    I would like to put equations inside a box. Now, I have found two ways to do this butthey work only for single line equations. The best method is to simply put the equations between boxed braces, i.e. \boxed{ equation}

    this works if I am in an equation array i.e.

    \begin{equation} \boxed{equation} \end{equation}

    I have tried the same thing in an eqnarray but I get compilations errors. I would like to have equations spanning several lines which would be inside a box.

    Anybody can help?

    Thanks
     
  2. jcsd
  3. Jan 13, 2008 #2

    OmCheeto

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    Gold Member

    There are instructions in the https://www.physicsforums.com/showthread.php?t=8997" here at the forum. I haven't read the entire thing. There are over 700 posts.
     
    Last edited by a moderator: Apr 23, 2017
  4. Jan 27, 2008 #3

    kdv

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    I found a way but I am not sure if it will work on the forums here, so here's the trick:
    [tex]
    \begin{equation*}
    \addtolength{\fboxsep}{5pt}
    \boxed{
    \begin{gathered}
    \Pi_{i=1}^m \int d^4x_i \, e^{-i (k \cdot x)_i} ~\Pi_{j=1}^n \int d^4y_j \, e^{+ i (p \cdot y)_j} \\
    <0| T\{ \phi(x_1) \ldots \phi(x_m) \phi(y_1) \ldots \phi(y_n) \} |0>
    \\ = \biggl( \Pi_{i=1}^m \frac{i \sqrt{Z}}{k_i^2 - m^2} \biggr) \biggl(\Pi_{j=1}^n \frac{i \sqrt{Z}}{p_j^2 - m^2} \biggr) ~<\vec{p}_1 \ldots \vec{p_n}|i T| \vec{k_1} \ldots \vec{k_m}>
    \end{gathered}
    }
    \end{equation*}
    [/tex]

    It worked!!!!!!

    (For anybody interested, left click on the equation to see the source code)
     
  5. May 13, 2010 #4
    Thanks a lot for this tip kdv I'd been wondering how to get boxes around multiline equations.

    Also, for alignment you can use the 'split' environment rather than 'gathered'.

    [tex]
    \begin{equation*}
    \addtolength{\fboxsep}{10pt}
    \boxed{
    \begin{split}
    \int \frac{d^D P}{(2\pi)^D} \frac{{\cal P}_n(P)}
    {P^{2\alpha}(P-Q)^{2\beta}} =
    &\frac{1}{(4\pi)^2}(Q^2)^{D/2-\alpha-\beta}\sum_{\sigma \ge 0}^{[n/2]}
    G(\alpha,\beta,n,\sigma) \cdot \\
    &\cdot Q^{2\sigma} \left\{ \frac{1}{\sigma !}
    \left( \frac {\Box} {4} \right) ^\sigma {\cal P}_n(P)\right\}_{P=Q}
    \end{split}
    }
    \end{equation*}
    [/tex]

    For anybody compiling this remember to include \usepackage{amsmath} in your preamble and for this particular example also \usepackage{amssymb} for the D'Alembertian.

    Thanks again.
     
  6. Jul 19, 2012 #5
    kdv, thanks for posting your answer after finding it. Google funneled me here, and your post has helped me out.
     
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