Flush leftmost column to left in alignat

Question

I'd like the (a) and (b) to be flushed to the left of the page, while "1+1=2" and "1+2=3" still remained aligned at the center of the page. What should I do?

Code:

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{alignat*}{2}
(a) &  & 1+1 & =2.\\
(b) &  & 1+2 & =3.
\end{alignat*}
\end{document}

Output:

use \tag{(a)} (or better just use align and let the automatic numbering add (a) and use the leqno package option so that comes on the left — David Carlisle, Apr 13 '18 at 07:47

score 1 · Answer 1 · answered Apr 13 '18 at 07:50

1

It looks like what you actually want are custom equation numbers on the left. To archive this, you can give the leqno option to amsmath to put all equation numbers on the left. (If you also want some equation number on the right, Tag placing with amsmath shows how to change this in some parts of a document. Then you can set the actual number/character/tag with \tag{...}:

\documentclass{article}
\usepackage[leqno]{amsmath}
\begin{document}
\begin{alignat*}{2}
\tag{a} 1+1 & =2.\\
\tag{b} 1+2 & =3.
\end{alignat*}
\end{document}

answered Apr 13 '18 at 07:50

Marcel Krüger

34,151

Is there a way to do this locally, i.e. for just one particular line in an alignat? – Apr 20 '18 at 00:58
@dtcm840 Do you mean a single alignat with some tags on the left and some on the right? – Marcel Krüger Apr 20 '18 at 04:35

Flush leftmost column to left in alignat

1 Answers1