Long equation does not page break

Question

I have a series of equations steps, about 20 lines or so. I would like to have it automatically decide page break when necessary, but it resists and always tries to stay in a whole page, rendering the previous page a lot of while space.

I tried \allowdisplaybreaks and \displaybreak, but doesn't seem to work.

{\allowdisplaybreaks\begin{equation}\allowdisplaybreaks[4]
\begin{split}\allowdisplaybreaks
\alpha\beta\gamma&=abc\\
=def\\
=ghi\\
\end{split}
\end{equation}}

Have you consider accepting the answer? – luchonacho Jul 12 '17 at 19:58 — luchonacho, Jul 12 '17 at 19:58

score 14 · Answer 1 · edited Jul 12 '17 at 20:27

14

From page 6 of the amsmath manual:

Certain equation environments wrap their contents in an unbreakable box, with the consequence that neither \displaybreak nor \allowdisplaybreaks will have any effect on them. These include split, aligned, gathered, and alignedat.

Put differently, use an align environment -- along with something like \allowdisplaybreaks.

Personally I always try to break up long sequences of equations with a few words or sentences.

edited Jul 12 '17 at 20:27

Mico

506,678

answered Jan 29 '12 at 21:20

Ian Thompson

43,767

1

This is a nice workaround but not really a solution. I think its a bug in LaTeX. – Jonas Stein Dec 15 '12 at 18:21
2

It is not a bug in LaTeX. It is the behaviour described by the package manual. – Ian Thompson Dec 16 '12 at 16:30
1

@IanThompson: In fairness, documenting an undesirable behaviour doesn't make it desirable by decree. This being fixed is not beyond debate in my opinion. :) – Neil G Dec 24 '12 at 06:53
3

You could justifiably argue that it is a limitation of the amsmath package, but it is neither a bug nor part of LaTeX itself. – Ian Thompson Dec 30 '12 at 18:04
@IanThompson -- the decision to disallow page breaking with split was based on long-standing publishing practice. you may disagree with it, but i believe i can find published documentation (from the metal type era) supporting it. – barbara beeton Jul 13 '17 at 01:40
@barbarabeeton --- I wasn't criticising the design. Other users argued that it is a bug; I pointed out that it isn't. – Ian Thompson Jul 13 '17 at 08:17
@IanThompson -- didn't mean to criticize you; just trying to provide a little background. (a lot of people seem to feel that decisions like this are arbitrary and/or "undesirable". that was the target of my comment.) – barbara beeton Jul 13 '17 at 14:06

Long equation does not page break

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