I can easily put right curly brace after group of (sub)equations:
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\setcounter{equation}{10}
\begin{equation}
\left.
\begin{split}
&g_{00}(x)=-1,\\
&g_{02}(x)=g_{20}(x)=
1\\
&g_{11}(x)=
2,\\
&g_{22}(x)=
3,\\
&g_{33}(x)=
4,
\end{split}
\right\}
\end{equation}
\end{document}
Is there a (standard?) method of putting such brace near the equation number (near (11) in the picture)?
Edit: I have in mind a fixed distance from the equation number.
Best Answer
It isn't standard, but here I introduce
\groupequation[<margin-offset>]{<content>}
.With the above answer, the offset from the margin is a fixed distance, overridden with the optional argument. An alternative is to make it a fixed distance from the label itself: