Latex question

  1. 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. OmCheeto

    OmCheeto 2,029
    Gold Member
    2014 Award

    There are instructions in the LaTeX thread here at the forum. I haven't read the entire thing. There are over 700 posts.
     
  4. 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. 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. kdv, thanks for posting your answer after finding it. Google funneled me here, and your post has helped me out.
     
Know someone interested in this topic? Share a link to this question via email, Google+, Twitter, or Facebook

Have something to add?
Similar discussions for: Latex question
Loading...