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\documentclass[11pt]{article}
\usepackage{amsmath}
\usepackage{empheq}
\newcommand*\widefbox[1]{\fbox{\hspace{2em}#1\hspace{2em}}}

\begin{itemize}
\item[1.] zz
\begin{itemize}
\item[1.1]

\begin{subequations}
\begin{empheq}[box=\widefbox]{align}
x \;&=\; x_1 = x_2 = x_3 = x_4 = x_5 = x_6 = 0 \\
y \;&=\; y_1 = y_2 = y_3 = y_4 = y_5 = y_6 = 0 
\end{empheq}
\end{subequations}

\item[1.2]
\end{itemize}
\item[2.]
\end{itemize}
\end{document}

The box will be mis-sized, not boxing the entire equations body.

6
2

The equations are centred with respect to the left margin of the current itemize environment and the right margin of the page, not taking into account the equation number. A work around could be adding \hphantom{tag} to the right of the empheq environment. I also managed to get the item number vertically aligned with the first line of the align environment:

\documentclass[a4paper]{article}
\usepackage{empheq}
\usepackage{amssymb}
\newcommand*\widefbox[1]{\fbox{\hspace{2em}#1\hspace{2em}}}

\begin{document}

\begin{itemize}
  \item[1.] zz
        \begin{itemize}%[leftmargin = *]
          \item[1.1]
                \leavevmode\vspace{\dimexpr-\baselineskip-\abovedisplayshortskip}
                \begin{subequations}
                  \begin{empheq}[box=\widefbox, right = \hphantom{2a}]{align}
                    x \;&=\; x_1 = x_2 = x_3 = x_4 = x_5 = x_6 = 0 \\
                    y \;&=\; y_1 = y_2 = y_3 = y_4 = y_5 = y_6 = 0
                  \end{empheq}
                \end{subequations}
                \noindent Text text text text text text text text text text text text text text text text text text text text text text text text text
          \item[1.2]
        \end{itemize}
  \item[2.]
\end{itemize}

\end{document} 

enter image description here

4
  • doesn't compile -- you're missing a closing brace at the end of the definition of \widefbox. also, amssymb is needed either; you probably meant amsmath, but with empheq that's taken care of. – barbara beeton Apr 24 '15 at 13:51
  • Oh yes! Bad copy-paste… Corrected now. Thanks for pointing it :o) – Bernard Apr 24 '15 at 13:58
  • Thanks a lot! just curious, do you generate the image using the site? or do you have to take screen-shot and upload? – DarknessGuideMe Apr 24 '15 at 23:09
  • I take a screenshot of my pdf viewer, after I've zoomed. – Bernard Apr 24 '15 at 23:20

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