gather is not aware of abovedisplayshortskip

Question

So in the following example we can see that gather does not insert \abovedisplayshortskip but probably inserts \abovedisplayskip.

\documentclass[twocolumn]{article}

\usepackage{amsmath}
\usepackage{lipsum}

\begin{document}

    \lipsum[1]
    \begin{equation}
        %\begin{gathered}
            123
        %\end{gathered}
    \end{equation}
    \lipsum[1]

    \newpage

    \lipsum[1]
    \begin{gather}
            567
    \end{gather}
    \lipsum[1]

\end{document}

Boris's answer mentioned this but it does not tell me how to avoid it. What is the correct way to bring back \abovedisplayshortskip? Does gathered inside equation produce the correct spacing?

This should almost certainly be considered a bug; please report it. — barbara beeton, Apr 04 '19 at 00:18
@Symbol1 It has been like this from day 1 of amsmath (it was the same with its ancestors). — egreg, Apr 04 '19 at 06:33
@DavidCarlisle -- I think this is in the (long neglected) list of bugs and requests; please check. (I don't question that it has been there forever and is known.) — barbara beeton, Apr 04 '19 at 18:50

score 3 · Answer 1 · answered Apr 04 '19 at 07:04

3

gather is like align and is always full width. This is the main reason why multi-line display environments should never be used for single line displays, and equation and \[ are still needed.

answered Apr 04 '19 at 07:04

David Carlisle

757,742

1

Years ago I saw a prototype Morten did, I think it was of gather, which could do the same as equation is needed. Don't know what happend to that code – daleif Apr 04 '19 at 08:30
2

@daleif yes all the ams displays do the measuring pass so in principle they could track the first and last line width and do something, .... – David Carlisle Apr 04 '19 at 08:32
I have been using align for years and did not notice this! – Symbol 1 Apr 04 '19 at 15:54
@daleif User wea0 proposed a solution for align, but not for gather, in this TeX StackExchange answer. – Gabriel A. Lozada Jul 05 '23 at 23:26

gather is not aware of abovedisplayshortskip

1 Answers1