I have equations inside an environment which has a larger left-margin than the main text (analogous to an enumerate/itemize environment, implemented with the changepage package's adjustwidth environment). Just as equations in enumerate/itemize behave, the equations are centered with respect to the entire text, rather than just the width of the container environment. I want the latter behavior.
I'm trying to accomplish this by wrapping all display-math in minipages. Namely, I'm modifying the mathdisplay environment in amsmath.sty as follows:
\makeatletter \let\oldmd\mathdisplay \def\mathdisplay#1{% \newline \begin{minipage}{\textwidth-\@totalleftmargin}% \oldmd{#1}% } \let\oldendmd\endmathdisplay \def\endmathdisplay#1{% \oldendmd{#1}% \end{minipage} } \makeatother This is almost working, but there are some issues with spacing which I don't understand how to fix. Here's how the the normal \[ ... \] and numbered \begin{equation} ... \end{equation} look with the above modification:
My main confusion is why the numbered version is behaving so differently from the unnumbered. But all in all I want to fix this so that the spacing above and below is even as it usually is. Any help is appreciated, thanks.
Edit: Here's a compilable example:
\documentclass{amsart} \usepackage{lipsum} \usepackage{calc} \usepackage{changepage} \makeatletter \let\oldmd\mathdisplay \def\mathdisplay#1{% \newline \begin{minipage}{\textwidth-\@totalleftmargin}% \oldmd{#1}% } \let\oldendmd\endmathdisplay \def\endmathdisplay#1{% \oldendmd{#1}% \end{minipage} } \makeatother \setlength{\parindent}{0pt} \begin{document} \lipsum[1] \begin{adjustwidth}{20pt}{} \lipsum[2] \[ x \mapsto \hom(-,x) \] \lipsum[3] \begin{equation} y \mapsto \hom(y,-) \end{equation} \lipsum[4] \end{adjustwidth} \lipsum[5] \end{document}