[OS X TeX] \intertext

Ross Moore ross at ics.mq.edu.au
Sat May 1 18:06:10 EDT 2010

Hi George,

On 02/05/2010, at 12:05 AM, George Gratzer wrote:

>> LaTeX sets these dimensions, defined by TeX itself:
>> \abovedisplayskip=12pt plus 3pt minus 9pt
>> \belowdisplayskip=12pt plus 3pt minus 9pt
> which is used when?

This is all in The TeXbook.
The above are usually used before and after the
displayed math environments, to give vertical
separation from surrounding paragraphs ...

> GG

  ... except when the line above/below is 'short'
(e.g. just a few words) in which case the 'shortskip'
versions below are used instead.

>> \abovedisplayshortskip=0pt plus 3pt
>> \belowdisplayshortskip=7pt plus 3pt minus 4pt

Note that  \abovedisplayshortskip  is roughly
a  \baselineskip  amount shorter than  \abovedisplayskip .
Thus the overall effect should be a fairly consistent
separation between the equations and surrounding text,
at least in the middle and right-hand side of the page.

But the plus/minus values allow for a significant amount
of flexibility when establishing page-breaks. Then it is
TeX's internal algorithms that accommodate this flexibility
and keep the spacing consistent across different displays.

>> You can adjust them locally.
>>> GG
>> Hope this helps,
>> 	Ross



Ross Moore                                       ross at maths.mq.edu.au
Mathematics Department                           office: E7A-419
Macquarie University                             tel: +61 (0)2 9850 8955
Sydney, Australia  2109                          fax: +61 (0)2 9850 8114

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