General ⇒ long equation in two-column article over and underlined

[pallav]

I have seen the topic "long equation across whole page in two-column document". What I need is exactly same as that but require solution in little different way.
My preamble contains

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\documentclass[twocolumn, runningheads]{article}

for which I cannot use every time

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 \begin{multicols}

 \end{multicols} 

I have a long equation, for example;

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\mathcal{R}^{(\text{d})}=
g_{\sigma_2}^e
\left(
   \frac{[\Gamma^Z(3,21)]_{\sigma_1}}{Q_{12}^2-M_W^2}
  +\frac{[\Gamma^Z(13,2)]_{\sigma_1}}{Q_{13}^2-M_W^2}
\right)
+ x_WQ_e
\left(
   \frac{[\Gamma^\gamma(3,21)]_{\sigma_1}}{Q_{12}^2-M_W^2}
  +\frac{[\Gamma^\gamma(13,2)]_{\sigma_1}}{Q_{13}^2-M_W^2}
\right)

I have to write this equation in one line and have to draw straight lines over and below the equation to separate it from texts. Please note, I have to write "twocolumn" in \documentclass according to the rule of the journal.

[gmedina]

Hi,

perhaps you could enclose your equation inside a figure* environment:

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\documentclass[twocolumn]{article} 
\usepackage{amsmath} 
\usepackage{lipsum} % to generate some filler text

\begin{document} 

\lipsum[1-5]

\begin{figure*}
  \hrulefill
  \begin{equation}
  \mathcal{R}^{(\text{d})}=
    g_{\sigma_2}^e
    \left(
     \frac{[\Gamma^Z(3,21)]_{\sigma_1}}{Q_{12}^2-M_W^2}
      +\frac{[\Gamma^Z(13,2)]_{\sigma_1}}{Q_{13}^2-M_W^2}
    \right)
    + x_WQ_e
    \left(
     \frac{[\Gamma^\gamma(3,21)]_{\sigma_1}}{Q_{12}^2-M_W^2}
      +\frac{[\Gamma^\gamma(13,2)]_{\sigma_1}}{Q_{13}^2-M_W^2}
    \right)
  \end{equation}
  \hrulefill
\end{figure*}

\lipsum[1-10]

\end{document}

Notice, however, that this will cause the equation to be placed in the top of the next page and not in the exact position where you wrote it in your code; if this is not acceptable, let us know and we'll think about some alternative.

[pallav]

It works fine. But the only problem that you have also mentioned that equations are not coming in proper place. I have lot of equations in my article, it is necessary to place them in proper place. Also I need all the equations aligned with the help of &=&. Please find a way for me to solve the problem. Thank you for all your effort. Thank you.

[gmedina]

It works fine. But the only problem that you have also mentioned that equations are not coming in proper place. I have lot of equations in my article, it is necessary to place them in proper place. Also I need all the equations aligned with the help of &=&. Please find a way for me to solve the problem. Thank you for all your effort. Thank you.

I don't think that an easy alternative solution can be found using article as the document class with the twocolumn option... can you use a different document class? (If I'm not mistaken, there's some class that allows switching between one and two columns in a more flexible way than the article class)

If you have a lot of long equations in your article, perhaps a twocolumn document isn't the best choice for you. What do you mean with the last part? All the equations in your article must be aligned, even if there are text paragraphs in-between them?

[pallav]

No only equations need to be aligned,there is no equation. Two column is must for my springer journal, and

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\documentclass[twocolumn, runningheads]{svjour3}

where svjour3 is suplied by the journal is also necessary. Please help me in the above said environment.

[gmedina]

No only equations need to be aligned,there is no equation...

I don't understand.

...Two column is must for my springer journal, and

Code: Select all

\documentclass[twocolumn, runningheads]{svjour3}

where svjour3 is suplied by the journal is also necessary. Please help me in the above said environment.

Have you seen the class user guide to see if it provides some environment to typeset long equations spanning both columns? Right now I won't be able to do some tests (I have to travel), but in 24 hours I will post a reply (if someone else hasn't done it by then).

[gmedina]

I reply as I promised, but with no good news; after some tests, I haven't found a solution to the problem of writing equations spanning both columns when using the twocolumn class option other than using figure* or table*.

Perhaps someone else could suggest a solution.

[pallav]

Thank you gmedina for all of your effort. I am in troble to solve the problem. I also requesting others for help in the above matter.