I got the following problem: Right now I am checking my equations, which are usually written in `align`

. This looks great in most of the cases, but sometimes the pagebreaks are weird, ie there is a lot of vertical whitespace left (like 2.5cm) at the end of a page. I made the following MWE to illustrate this.

```
\documentclass[a4paper, 12pt, headsepline]{scrreprt}
\usepackage[onehalfspacing]{setspace}
\usepackage{amsmath, amssymb, mathtools}
\usepackage{mathptmx}
\usepackage[a4paper]{geometry}
\geometry{left=2cm,right=5cm,top=2cm,bottom=2cm}
% \usepackage{lipsum} %\lipsum
\usepackage[pangram]{blindtext}
\begin{document}
\Blindtext[1][3]%1 paragraph, 3 pangrams
\begin{align}
X_{t+1} &= \frac{X_{t+1}+X_{t+1}}{Y_t} \label{eq:1}
\intertext{Solving...:} \notag
X_{t} &= \frac{X_{t+1}+X_{t+1}}{Y_{t+1}} \notag \\
\intertext{Solving further...:} \notag
% ===PAGEBREAK HERE: 2nd page begins===
&= \frac{X_{t+1}+X_{t+1}}{Y_t} +
\frac{X_{t+1}+X_{t+1}}{Y_t} \notag \\
&= \frac{X_{t+1}+X_{t+1}}{Y_t}... \notag \\
\intertext{Solving further...:} & = \frac{X_{t+1}+X_{t+1}}{Y_t} \notag
\end{align}
\end{document}
```

In the MWE, the first 'Solving further' should be on the first page instead (to save space and it would also look better I guess?). The position where I would like the pagebreak to be is also marked as a comment in the MWE.

My question is first on a general basis: Which is the best environment to achieve multiple line equations, which can be aligned as in `align`

, and to save space at the same time? Or to be more precise: If possible, I'd like to stick with `align`

and adapt the pagebreaks only if necessary.

Thanks!

## Best Answer

If you want automatic page breaks you have to use the command

`\allowdisplaybreaks`

in your preamble.If you want manual page breaks, you have to use the command

`\displaybreak`

followed by`\\`

, as in the following MWE:Output