[OS X TeX] two-page split equation

[Morten Høgholm]

On Sun, 09 Apr 2006 22:42:46 +0200, Alain Schremmer  
<Schremmer.Alain at gmail.com> wrote:

> I was wrong about the Companion 2ed. Here is indeed what it says in part  
> on page 481:
>
>     The command \allowdisplaybreaks, which obeys the usual LaTeX scoping
>     rules, is equivalent to putting \displaybreak before every line in
>     /any/ display environment within its scope; […]
>
> However, "scope" does not appear in the index and various attempts have  
> failed but without the console objecting. On the other hand, the console  
> objects my placing \displaybreak "anywhere".
>
> So, is Høgholm's "The split environment creates an unbreakable box" in  
> fact true contrary to what Companion 2ed seems to be saying or am I am  
> missing something big?

It is true (even though I said it :-). From amsldoc, § 3.9:

Note: 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.
-- 
Morten
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