# Formatting of an array of equations (left alignment)

I have the following text in a matrix environment. Is there a better way to format it, say with each column being left ordered, and how can this be done?

$$\begin{matrix} \Gamma^{i}_{\mbox{ }0i}=\frac{\dot{a}}{a} \mbox{ ,i from 1..3 } & \Gamma^{0}_{\mbox{ }11}=\frac{a\dot{a}}{1-kr^{2}} & \Gamma^{0}_{\mbox{ }22}=\dot{a}ar^{2} & \Gamma^{0}_{\mbox{ }33}=\dot{a}ar^{2}\sin^{2}{(\theta)} \\ \Gamma^{1}_{\mbox{ }11}=+\frac{kr}{1-kr^{2}} & \Gamma^{1}_{\mbox{ }22}=-r(1-kr^{2}) & \Gamma^{1}_{\mbox{ }33}=-(1-kr^{2})r\sin^{2}{(\theta)} & \Gamma^{2}_{\mbox{ }12}=\frac{1}{r} \\ \Gamma^{3}_{\mbox{ }23}=\cot{(\theta)} & \Gamma^{3}_{\mbox{ }13}=\frac{1}{r} & \Gamma^{2}_{\mbox{ }33}=-\sin{(\theta)}\cos{(\theta)} \end{matrix}$$


I'd change the way you lay out the formulas, reserving a row for the "0i" case, one for \Gamma^1, one for \Gamma^2 and one for \Gamma^3.

The first row is artificially made shorter to TeX's eyes, so that the textual annotation is not taken into consideration for the spacing.

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{aligned} & \Gamma^{i}{}_{0i}=\frac{\dot{a}}{a} \makebox[0pt][l]{\quad(i from 1 to 3)} \\ & \Gamma^{0}{}_{11}=\frac{a\dot{a}}{1-kr^{2}} && \Gamma^{0}{}_{22}=\dot{a}ar^{2} && \Gamma^{0}{}_{33}=\dot{a}ar^{2}\sin^{2}(\theta) \\ & \Gamma^{1}{}_{11}=+\frac{kr}{1-kr^{2}} && \Gamma^{1}{}_{22}=-r(1-kr^{2}) && \Gamma^{1}{}_{33}=-(1-kr^{2})r\sin^{2}(\theta) \\ & \Gamma^{2}{}_{12}=\frac{1}{r} && \Gamma^{2}{}_{33}=-\sin(\theta)\cos(\theta) \\ & \Gamma^{3}{}_{23}=\cot(\theta) && \Gamma^{3}{}_{13}=\frac{1}{r} \end{aligned}
\end{document}


Note that staggering of indices can be obtained more easily with {}_ than with \mbox{ } in the subscript.

Check Why is $…$ preferable to $$? for why $$ should never be used.

• how did that \Gamma^{2}{}_{33} sneak down into the last line? Commented Mar 23, 2013 at 17:17
• @barbarabeeton Because I didn't see well the superscript. :) Commented Mar 23, 2013 at 17:23
• looks much nicer now. still one niggle -- wouldn't the 13 entry logically make more sense before the 23 one in the last line? Commented Mar 23, 2013 at 17:49
• @barbarabeeton Maybe. I consider this just an example (and it was so in the original post). Commented Mar 23, 2013 at 17:51

Please always post complete documents not just fragments. Here I've use align* and also removed the \mbox{ } markup. It's too wide at the standard size, but I don't know what page sizes you are using. It can always be re-arranged to have 3 rather than 4 equations on each line.

\documentclass{article}

\usepackage{amsmath}

\begin{document}

\begin{align*}
{\Gamma^{i}}_{0i}&=\frac{\dot{a}}{a} \mbox{ ,i from 1..3 }
& {\Gamma^{0}}_{11}&=\frac{a\dot{a}}{1-kr^{2}}
& {\Gamma^{0}}_{22}&=\dot{a}ar^{2}
& {\Gamma^{0}}_{33}&=\dot{a}ar^{2}\sin^{2}{(\theta)}
\\
{\Gamma^{1}}_{11}&=+\frac{kr}{1-kr^{2}}
& {\Gamma^{1}}_{22}&=-r(1-kr^{2})
& {\Gamma^{1}}_{33}&=-(1-kr^{2})r\sin^{2}{(\theta)}
& {\Gamma^{2}}_{12}&=\frac{1}{r}
\\
{\Gamma^{3}}_{23}&=\cot{(\theta)}
& {\Gamma^{3}}_{13}&=\frac{1}{r}
& {\Gamma^{2}}_{33}&=-\sin{(\theta)}\cos{(\theta)}
\end{align*}

\end{document}