Sstrhsrtj

I am using mdframed to box equations to include the equation number, as I quite like how it looks. However I've noticed that this results in a misalignment between equation numbers that are boxed, and those that are not. Is there an easy fix for this, or is it recommended to use a different method to mdframed?

Below is an example of how I'm using it.

documentclass{article}



usepackage{amsmath}

usepackage{mdframed}



begin{document}



Here is an important equation I would like to highlight:

begin{mdframed}

begin{equation}

e^{ipi}=-1

end{equation}

end{mdframed}



Here is an equation not important enough to deserve a highlight:

begin{equation}

y=mx+c

end{equation}



end{document}

Any advice is appreciated.

It is easiest to let the frame extend in to the right margin:

documentclass{article}



usepackage{amsmath}

usepackage{mdframed}



newlength{mywidth}

setlength{mywidth}{dimexprlinewidth+mdflength{innerrightmargin}+mdflength{linewidth}}



begin{document}





Here is an important equation I would like to highlight:

begin{mdframed}[userdefinedwidth=mywidth]

begin{equation}

e^{ipi}=-1

end{equation}

end{mdframed}



Here is an equation not important enough to deserve a highlight:

begin{equation}

y=mx+c

end{equation}



end{document}

To go the other way, you could perhaps include all displays in an mdframed, but just hide the lines:

documentclass{article}



usepackage{amsmath}

usepackage{mdframed}



newbool{equationframe}

surroundwithmdframed[hidealllines=ifbool{equationframe}{false}{true}]{equation}

boolfalse{equationframe}



begin{document}



Here is an important equation I would like to highlight but first

enough text to show the width of the line:

{booltrue{equationframe}%

begin{equation}

  e^{ipi}=-1

end{equation}}



Here is an equation not important enough to deserve a highlight but

first enough text to show the width of the line:

begin{equation}

  y=mx+c

end{equation}



end{document}

Here I have added an extra flag dedicated to frames for equations, to avoid setting hidealllines globally and thus affecting other mdframed environments.