## LaTeX forum ⇒ Math & Science ⇒ (solved) Aligned equations, individually numbered, all inside one pair of delimiters? Topic is solved

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Mrhnhrm
Posts: 3
Joined: Tue Dec 03, 2019 9:29 am

### (solved) Aligned equations, individually numbered, all inside one pair of delimiters?

Hi, and thanks for taking a look.

So, I am trying to make a bunch of equations that are aligned, individually automatically numbered, and all of them neatly packaged into an arbitrary set of delimiters. As they say, a picture is worth a thousand words; so, please see the attached image for a (very) schematic example of what I am trying to achieve.

Any ideas on how to do this would be kindly appreciated.

p.s. solution found here.
Attachments
math-visual-example.png (25.43 KiB) Viewed 3163 times
Last edited by Mrhnhrm on Thu Dec 05, 2019 8:17 am, edited 1 time in total.

Ijon Tichy
Posts: 472
Joined: Mon Dec 24, 2018 10:12 am

Mrhnhrm
Posts: 3
Joined: Tue Dec 03, 2019 9:29 am

Many thanks. May I ask for some further explanation? I looked through the (rather concise) manual for the package cases, and I couldn't figure out how to customize the alignment. The expressions (left part of the cases environment) seem to be invariably left-aligned, and the explanations (right part of the environment) form another left-aligned column, with unnecessarily wide horizontal gap. My example renders like this:
\documentclass[]{article}
\usepackage{cases}

\begin{document}

\begin{numcases}{}
e \approx 2.72 \\
\pi \approx 3.14 \\
e\pi \approx 8.5397
\end{numcases}

\begin{numcases}{}
e & $\approx 2.72$ \\
\pi & $\approx 3.14$ \\
e\pi & $\approx 8.5397$
\end{numcases}

\end{document}
Attachments
Screenshot_20191203_194751.png (18.83 KiB) Viewed 3154 times

Mrhnhrm
Posts: 3
Joined: Tue Dec 03, 2019 9:29 am
... and nailed it. Package empheq gets the job done. For example...
\documentclass[]{article}
\usepackage{amsmath}
\usepackage{empheq}
\begin{document}

\begin{subequations}
\begin{empheq} [left=\empheqlbrace] {align}
e & \approx 2.72 \\
\pi & \approx 3.14 \\
e\pi & \approx 8.5397
\end{empheq}
\end{subequations}

\end{document}