Small box just surrounding the equation, not the whole line?

Question

The following example makes a huge box that's the full width of the text, including the equation number:

\begin{framed}
\begin{equation}
  x=y
\end{equation}  
\end{framed}

Is there a way to get a box just around the equation itself?

Answer 1

Best is to use boxed from amsmath.

\documentclass{article}
\usepackage{amsmath}
\begin{document}
Using \verb|boxed| from \verb|amsmath|:
\begin{equation}
\boxed{x=y}
\end{equation}
Using \verb|fbox|:
\begin{equation}
\fbox{$x=y$}
\end{equation}

\end{document}

If you use align and friends from amsamth, you are better off with Aboxed from mathtools package. A relevant and useful reference will be This question and its answers.