[Tex/LaTex] How to choose the location of equation numbering

equationsnumbering

The location of the equation numbering is placed automatically. How is it possible to choose where should it be? For example in the attached picture the index G.13 appears at the bottom, how can I put in the second line?
I tried to work with \nonumber but didn't manage to.

code:

\begin{equation}\begin{split}
&\widetilde{K}(x_{\perp},\, y_{\perp},\, z_{\perp},\, z_{\perp}^{\prime})\,=\,\frac{\alpha_{s}^{2}}{16\pi^{4}\left((X^{\prime})^{2}Y^{2}-X^{2}(Y^{\prime})^{2}\right)}\left(\frac{(Y^{\prime})^{2}}{Z^{2}}-\frac{(Y^{\prime})^{4}X^{2}}{(X^{\prime})^{2}Z^{2}Y^{2}}-\frac{Y^{4}(X^{\prime})^{2}}{Z^{2}X^{2}(Y^{\prime})^{2}}+\frac{Y^{2}}{Z^{2}}\right.\\
&+\frac{(X^{\prime})^{2}Y^{2}}{Z^{2}(Y^{\prime})^{2}}-\frac{X^{2}}{Z^{2}}-\frac{(X^{\prime})^{2}}{Z^{2}}+\frac{X^{2}(Y^{\prime})^{2}}{Z^{2}Y^{2}}+\frac{(X^{\prime})^{2}(X-Y)^{2}}{X^{2}Z^{2}}-\frac{(Y^{\prime})^{2}(X-Y)^{2}}{Z^{2}Y^{2}}-\frac{Y^{2}(X-Y)^{2}}{Z^{2}(Y^{\prime})^{2}}\\
&\left.+\frac{X^{2}(X-Y)^{2}}{(X^{\prime})^{2}Z^{2}}+\frac{Y^{2}(X-Y)^{2}}{X^{2}(Y^{\prime})^{2}}-\frac{(X-Y)^{2}}{(X^{\prime})^{2}}-\frac{(X-Y)^{2}}{X^{2}}+\frac{(Y^{\prime})^{2}(X-Y)^{2}}{(X^{\prime})^{2}Y^{2}}\right)\ln\left(\frac{X^{2}}{(X^{\prime})^{2}}\right)+\left(x_{\perp}\leftrightarrow y_{\perp}\right),\\
\end{split}\end{equation}

Best Answer

I propose one of these three solutions:

Either use the fleqn environment from nccmath, which aligns equations on the leftmargin, and an `aligned environment. It requires $4$ lines for the equation to fit between margins.

Or use the flalign environment from amsmath. It requires only $3$ lines, and the placement of the tag in on the middle line, using `\notag on the 1st and last lines.

Or use the split environment, and \mathrlap for the end of the third line which is a little too long, whereas it doesn't require space for the equation number. I also simplified your code, replacing (…^{\prime})^2 with a simple …'^2, and for a better spacing, I replaced the many \left( … \right) pairs with \biggl( … \biggr), or ( … ), if they were not necessary.

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[showframe]{geometry}%
 \usepackage{mathtools, nccmath}

\begin{document}

\mbox{}
  \begin{equation}
    \begin{aligned}\widetilde{K}(x_{ ⊥ },\, y_{ ⊥ },\, z_{ ⊥ },\, z_{ ⊥ }^{\prime}) = {} & \frac{\alpha_{s}^{2}}{16\pi^{4}(X'^{2}Y^{2}-X^{2}Y'^{2})} \biggl[\frac{Y'^{2}}{Z^{2}}-\frac{Y'^{4}X^{2}}{X'^{2}Z^{2}Y^{2}} - \frac{Y^{4}X'^{2}}{Z^{2}X^{2}Y'^{2}} \\%
          & + \frac{Y^{2}}{Z^{2}} + \frac{X'^{2}Y^{2}}{Z^{2}Y'^{2}} - \frac{X^{2}}{Z^{2}} - \frac{X'^{2}}{Z^{2}} + \frac{X^{2}Y'^{2}}{Z^{2}Y^{2}} + \frac{X'^{2}(X-Y)^{2}}{X^{2}Z^{2}} \\ %
          & - \frac{Y'^{2}(X-Y)^{2}}{Z^{2}Y^{2}} - \frac{Y^{2}(X-Y)^{2}}{Z^{2}Y'^{2}} +\frac{X^{2}(X-Y)^{2}}{X'^{2}Z^{2}}+\frac{Y^{2}(X-Y)^{2}}{X^{2}Y'^{2}} \\
          & - \frac{(X-Y)^{2}}{X'^{2}} - \frac{(X-Y)^{2}}{X^{2}} + \frac{Y'^{2}(X-Y)^{2}}{X'^{2}Y^{2}}\biggr] \ln\biggl(\frac{X^{2}}{X'^{2}}\biggr) + (x_{ ⊥ }\leftrightarrow y_{ ⊥ }),
      \end{aligned}
    \end{equation}
    \bigskip

    \begin{flalign} & \widetilde{K}(x_{ ⊥ } ,\, y_{ ⊥ },\, z_{ ⊥ },\, z_{ ⊥ }') = \frac{\alpha_{s}^{2}}{16\pi^{4}(X'^{2}Y^{2}-X^{2}Y'^{2})} \left[\frac{Y'^{2}}{Z^{2}}-\frac{Y'^{4}X^{2}}{X'^{2}Z^{2}Y^{2}} - \frac{Y^{4}X'^{2}}{Z^{2}X^{2}Y'^{2}} + \frac{Y^{2}}{Z^{2}} \right. \notag\\%
        & + \frac{X'^{2}Y^{2}}{Z^{2}Y'^{2}} - \frac{X^{2}}{Z^{2}} - \frac{X'^{2}}{Z^{2}} + \frac{X^{2}Y'^{2}}{Z^{2}Y^{2}} + \frac{X'^{2}(X-Y)^{2}}{X^{2}Z^{2}} - \frac{Y'^{2}(X-Y)^{2}}{Z^{2}Y^{2}} - \frac{Y^{2}(X-Y)^{2}}{Z^{2}Y'^{2}} \\ %
      & +\frac{X^{2}(X-Y)^{2}}{X'^{2}Z^{2}}+\frac{Y^{2}(X-Y)^{2}}{X^{2}Y'^{2}} -\frac{(X-Y)^{2}}{X'^{2}}-\frac{(X-Y)^{2}}{X^{2}}+ \frac{Y'^{2}(X-Y)^{2}}{X'^{2}Y^{2}}\biggr]\!\ln\biggl(\frac{X^{2}}{X'^{2}}\biggr)+(x_{ ⊥ }\leftrightarrow y_{ ⊥ }),\notag
    \end{flalign}
    \bigskip

    \begin{equation}
    \begin{split}
     & \widetilde{K}(x_{\perp},\, y_{\perp},\, z_{\perp},\, z_{\perp}^{\prime}) = \frac{\alpha_{s}^{2}}{16\pi^{4}(X'^{2}Y^{2}-X^{2}Y'^{2})}%
    \biggl[\frac{Y'^{2}}{Z^{2}}-\frac{Y'^{4}X^{2}}{X'^{2}Z^{2}Y^{2}}%
    -\frac{Y^{4}X'^{2}}{Z^{2}X^{2}Y'^{2}}\mathrlap{+\frac{Y^{2}}{Z^{2}}}\\
    {}+{} &\frac{X'^{2}Y^{2}}{Z^{2}Y'^{2}}-\frac{X^{2}}{Z^{2}}-\frac{X'^{2}}{Z^{2}}%
    +\frac{X^{2}Y'^{2}}{Z^{2}Y^{2}}+\frac{X'^{2}(X-Y)^{2}}{X^{2}Z^{2}}%
    -\frac{Y'^{2}(X-Y)^{2}}{Z^{2}Y^{2}}-\frac{Y^{2}(X-Y)^{2}}{Z^{2}Y'^{2}}\\
    {}+{} &\frac{X^{2}(X-Y)^{2}}{X'^{2}Z^{2}}+\frac{Y^{2}(X-Y)^{2}}{X^{2}Y'^{2}}%
    -\frac{(X-Y)^{2}}{X'^{2}}-\frac{(X-Y)^{2}}{X^{2}}%
    +\frac{Y'^{2}(X-Y)^{2}}{X'^{2}Y^{2}}\biggr]\!\ln\biggl(\frac{X^{2}}{X'^{2}}\biggr)%
    +(x_{\perp}\mathrlap{\leftrightarrow y_{\perp}),}
    \end{split}
    \end{equation}

\end{document}

Related Solutions

[Tex/LaTex] How to change the position of equation number locally if I am not using the amsmath package

Others have now posted answers, but for the record this is what I had in mind. It works with all the standard classes (article, memoir, scrartcl, etc.), but not if you load amsmath, so the AMS classes, see below.

Sample output

\documentclass{article}

\makeatletter
\let\r@eqnnum\@eqnnum
\input{leqno.clo}
\let\l@eqnnum\@eqnnum
\newcommand{\leqnos}{\let\@eqnnum\l@eqnnum}
\newcommand{\reqnos}{\let\@eqnnum\r@eqnnum}
\reqnos
\makeatother

\begin{document}

\begin{equation}
  \label{eq:x}
  x = y
\end{equation}

\begingroup\leqnos
\begin{equation}
  \label{eq:a}
  a = b
\end{equation}\endgroup
and
\begin{equation}
  \label{eq:b}
  b = a.
\end{equation}

\end{document}

If you load amsmath (directly or indirectly, via e.g. mathtools or an AMS documentclass), then as Silvio Levy points the position of the labelling is controlled by different variables. In this case you can use, the following:

\documentclass{article}

\usepackage{amsmath}
\makeatletter
\newcommand{\leqnos}{\tagsleft@true\let\veqno\@@leqno}
\newcommand{\reqnos}{\tagsleft@false\let\veqno\@@eqno}
\reqnos
\makeatother

\begin{document}

\begin{equation}
  \label{eq:x}
  x = y
\end{equation}

\begingroup\leqnos
\begin{equation}
  \label{eq:a}
  a = b
\end{equation}\endgroup
and
\begin{equation}
  \label{eq:b}
  b = a.
\end{equation}

\end{document}

Table of Contents – List of Equations Including Contents and Captions: A How-To Guide

Since you want a cheat sheet, I'd recommend the extract package. With a slightly different MWE:

\documentclass{article}
\usepackage[
  active,
  header=false,
  copydocumentclass=true,
  generate=\jobname-Cheatsheet,
  extract-env={equation},
  extract-cmdline={synopsis},
  ]{extract} % http://ctan.org/pkg/extract
\begin{extract*}
% Items executed in both the main and extracted document
% (extract manual, section 5.1)
\usepackage{amsmath}
\end{extract*}
\begin{extract}
% Items executed only in extracted document
\def\synopsis#1{#1}
\end{extract}
\def\synopsis#1{}
\begin{document}
First Euler observed that
\synopsis{Euler's equation tying together the five fundamental constants of mathematics}%
\begin{equation}
1 + e^{i \Pi} = 0.
\end{equation}

Then, Gauss discovered the normal distribution:
\synopsis{Normal distribution}%
\begin{equation}
P(x) = \frac{1}{{\sigma \sqrt {2\pi } }}e^{{{ - \left( {x - \mu } \right)^2 } \mathord{\left/ {\vphantom {{ - \left( {x - \mu } \right)^2 } {2\sigma ^2 }}} \right. \kern-\nulldelimiterspace} {2\sigma ^2 }}}
\end{equation}

Finally, Einstein proclaimed: 
\synopsis{Equivalence of mass and energy}%
\begin{equation}
E = m C^2
\end{equation}
\end{document}

you get an original document of:

enter image description here

and an extracted document of:

\documentclass{article}
% Items executed in both the main and extracted document
% (extract manual, section 5.1)
\usepackage{amsmath}
% Items executed only in extracted document
\def\synopsis#1{#1}

\begin{document}

\synopsis{Euler's equation tying together the five fundamental constants of mathematics}%

\begin{equation}
1 + e^{i \Pi} = 0.
\end{equation}

\synopsis{Normal distribution}%

\begin{equation}
P(x) = \frac{1}{{\sigma \sqrt {2\pi } }}e^{{{ - \left( {x - \mu } \right)^2 } \mathord{\left/ {\vphantom {{ - \left( {x - \mu } \right)^2 } {2\sigma ^2 }}} \right. \kern-\nulldelimiterspace} {2\sigma ^2 }}}
\end{equation}

\synopsis{Equivalence of mass and energy}%

\begin{equation}
E = m C^2
\end{equation}

\end{document}

and:

enter image description here

This also works with your original \caption command.

Best Answer

Related Solutions

[Tex/LaTex] How to change the position of equation number locally if I am not using the amsmath package

Table of Contents – List of Equations Including Contents and Captions: A How-To Guide

Related Question