alignamsmathequationsnumberingpage-breaking
I am using align*, but I still need an equation number. I know one solution is to use align and add \nonumber to all lines but the last. Is there a 'lazy' way to do it?
I searched a little and found similar ones suggesting use split:
Show equation number only once in align environment
Unfortunately, due to the page break issue I have, I need to use align, because split won't auto page break, as described in Long equation does not page break.
You can use tabular*, with an \extracolsep{\fill} to move the last column to the right margin, as in:
\documentclass[12pt]{article}
\begin{document}
Here's some text. Here's some text. Here's some text. Here's some
text. Here's some text. Here's some text. Here's some text. Here's
some text. Here's some text. Here's some text. Here's some
text. Here's some text.
\begin{center}
\begin{tabular*}{1.0\linewidth}{@{}ccc@{\extracolsep{\fill}}r@{}}
One& Two& Three& Number 1\\
Four& Five& Six& Number 2
\end{tabular*}
\end{center}
\end{document}
That gives you:
(If you don't want it flush with the left margin, you can add an \hskip to that initial @{}.)
Use \hphantom to obtain the correct horizontal spacing without typesetting anything:
\documentclass{article}
\usepackage{amsmath}% http://ctan.org/pkg/amsmath
\begin{document}
\begin{align*}
f & = \int a(x) dx \\
& = \int b(x) \\
& \hphantom{{}=\int b(x)}\cdot c(x) dx
\end{align*}
\end{document}
Best Answer
Use
\tag:See page 3 of the amsmath package documentation for details.