# Aligned equation which can break through pages [duplicate]

I'm writing long sequences of aligned math equations, and LaTeX interprete them as single, unbreakable objects... which is Ok if the equation is nowhere near the end of the page.

Q: Is there a way to (automatically) break the align equation through pages?

In the code below,

\documentclass{report}
\usepackage{amsmath}
\usepackage{lipsum}

\begin{document}
\lipsum[1-4]
\begin{align*}
FFFFFFFFFFFFFFFFFFFFFFFF &= \partial_t(p)\\
&= \partial_t(m v)\\
&= m a\\
&= m \dot{v}\\
&= m \ddot{x}\\
&= \partial_t(p)\\
&= \partial_t(m v)\\
&= ma\\
&= m \dot{v}\\
&= m \ddot{x}
\end{align*}
\end{document}


all of the equation goes to the second page. I do not want that

If I break manually, by closing the align and open another, I lose the alignment with the previous part.

\documentclass{report}
\usepackage{amsmath}
\usepackage{lipsum}

\begin{document}
\lipsum[1-4]
\begin{align*}
FFFFFFFFFFFFFFFFFFFFFFFF &= \partial_t(p)\\
&= \partial_t(m v)\\
&= m a\\
&= m \dot{v}\\
&= m \ddot{x}\\
\end{align*}
\begin{align*}
&= \partial_t(p)\\
&= \partial_t(m v)\\
&= m a\\
&= m \dot{v}\\
&= m \ddot{x}
\end{align*}
\end{document}


I do not want that either.

So far I read about breqn packages, but it seems not to do what I would like.

Any Suggestion?? Thx.

## marked as duplicate by David Carlisle, barbara beeton, Thorsten, Mensch, mafpJun 14 '13 at 13:45

• we should probably close as duplicate then? (Stefan goes in to more detail there, although it's not accepted) – David Carlisle Jun 14 '13 at 12:58

Use \displaybreak to force a break after a specified line or add \allowdisplaybreaks in your preamble to allow them generally.

• Thank you @david-calister. I follow your suggestion, it worked like a charm! Also found this post. Cheers. – Dox Jun 14 '13 at 12:48
• @Dox Just a friendly reminder: Accepting and upvoting answers is the preferred way here to say “thank you” to users who helped you. :-) – Sean Allred Jun 14 '13 at 13:00
• @sean-allred Got it present, but the answer was so fast that the page do not allow an acceptance yet! :-P – Dox Jun 14 '13 at 13:03