4

I am having an issue with the automatic LaTeX equation and label formatting on one of my longer equations (see results below).

Minimum Working Example

\documentclass[11pt]{article}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{graphicx}
\usepackage{epstopdf}
\usepackage{xfrac}
\usepackage[a4paper]{geometry}
\geometry{top=1in, bottom=1in,
      left=1in, right=1in}
\usepackage[usenames,dvipsnames]{color}
\newcommand{\Cline}[2][red]{
\text{\oalign{$#2$\cr\color{#1}\leaders\hrule height 0.80pt\hfil\cr}}}

\begin{document}
\numberwithin{equation}{section}

\begin{equation}
a=b
\end{equation}
\begin{equation}
a=b
\end{equation}
\begin{equation}
a=b
\end{equation}
\begin{equation}
a=b
\end{equation}
\begin{equation}
a=b 
\end{equation}
\begin{equation}
a=b
\end{equation}
\begin{equation}
a=b
\end{equation}
\begin{equation}
a=b
\end{equation}
\begin{equation}
a=b
\end{equation}

\noindent Expanding the covariant derivatives then yields
\begin{equation}
\begin{split}
R^{\sigma}_{\mu\rho\nu} = \bar{R}^{\sigma}_{\mu\rho\nu} &+\tfrac{1}{2} \bar{g}^{\sigma\beta}\partial_{\rho}\bigl(\partial_{\mu}h_{\nu\beta} -\! \bar{\Gamma}^{\tau}_{\mu\nu}h_{\tau\beta} -\! \Cline[Orange]{\bar{\Gamma}^{\tau}_{\mu\beta}h_{\tau\nu}}\bigr) +\tfrac{1}{2} \bar{g}^{\sigma\beta}\partial_{\rho}\bigl(\partial_{\nu}h_{\mu\beta} -\! \bar{\Gamma}^{\tau}_{\mu\nu}h_{\tau\beta} -\! \Cline[Magenta]{\bar{\Gamma}^{\tau}_{\nu\beta}h_{\tau\mu}}\bigr) \\ &-\tfrac{1}{2} \bar{g}^{\sigma\beta}\partial_{\rho}\bigl(\partial_{\beta}h_{\mu\nu} -\! \Cline[Orange]{\bar{\Gamma}^{\tau}_{\beta\mu}h_{\tau\nu}} -\! \Cline[Magenta]{\bar{\Gamma}^{\tau}_{\beta\nu}h_{\tau\mu}}\bigr) -\tfrac{1}{2} \bar{g}^{\sigma\alpha}\partial_{\nu}\bigl(\partial_{\mu}h_{\rho\alpha} -\! \bar{\Gamma}^{\tau}_{\mu\rho}h_{\tau\alpha} -\! \Cline[Green]{\bar{\Gamma}^{\tau}_{\mu\alpha}h_{\tau\rho}}\bigr) \\ &-\tfrac{1}{2} \bar{g}^{\sigma\alpha}\partial_{\nu}\bigl(\partial_{\rho}h_{\mu\alpha} -\! \bar{\Gamma}^{\tau}_{\rho\mu}h_{\tau\alpha} -\! \Cline[Blue]{\bar{\Gamma}^{\tau}_{\rho\alpha}h_{\tau\mu}}\bigr) +\tfrac{1}{2} \bar{g}^{\sigma\alpha}\partial_{\nu}\bigl(\partial_{\alpha}h_{\mu\rho} -\! \Cline[Green]{\bar{\Gamma}^{\tau}_{\alpha\mu}h_{\tau\rho}} -\! \Cline[Blue]{\bar{\Gamma}^{\tau}_{\alpha\rho}h_{\tau\mu}}\bigr).
\end{split}
\end{equation}
With the symmetries of the Christoffel symbols, the underlined terms cancel, whereas the
\end{document}

Equation (0.10)

The MWE above gives the result enter image description here

I think this looks ugly.

Equation (0.9)

Here is what the same equation looks like if you delete on of the $a=b$ equation:

enter image description here

I think that this formatting looks better, with the label at the side. LaTeX is obviously following some predefined rule about spacing, the label won't fit in the above example, so it puts it at the bottom. Is there a nice way to over-rule this? Or, is there a way to move my equation slightly to the left so that the label would fit according to what LaTeX 'thinks' is best.

3
  • The problem is that your label gets too wide...
    – vonbrand
    Feb 26, 2013 at 15:34
  • 2
    Perhaps split before the first +? That also separates the part of the formula you are really messing with...
    – vonbrand
    Feb 26, 2013 at 15:36
  • @vonbrand's first comment: You don't say.
    – User 17670
    Feb 26, 2013 at 15:46

1 Answer 1

1

It's a quick hack and not exactly user-friendly, but a simple \hspace{-1cm} right after \begin{split} does the trick:

output

Of course you can mess with the actual value inside \hspace to your fancy, so long as it's negative (a positive argument will obviously move it to the right).

4
  • 1
    I would prefer \mkern-5mu
    – user11232
    Feb 26, 2013 at 15:23
  • Plain TeX is weird. While I barely know what that means, \hspace is more clear as to what it's doing. What does \mkern do differently from \hspace (or \kern, for all that matters)? Feb 26, 2013 at 15:25
  • @vermiculus -- your hack assumes that the two text lines shown begin paragraphs. otherwise, the equation will be shifted beyond the left margin, which isn't such a good idea. and, looking at the mwe, the text does not begin paragraphs. Feb 27, 2013 at 21:04
  • @barbarabeeton -- I tried the MWE straight from the question. When it comes right down to it, the only other option is somehow altering the size of the reference (possibly rotation? it would be interesting to see), the spacing/sizing of the mathematics, rearrange the equation itself, or sacrifice the margins. It is by all means a hack, but it's one that seems to get the job done for this application. Other applications will undoubtedly need fiddling with the length (or better yet, runtime-calculation of the lengths required). It's a sacrifice. Feb 27, 2013 at 21:19

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