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Thanks so much. It's just what I want!

Hi Stefan,

Thanks for the suggestion. My code is as follows:

\[
\begin{array}{l}
\overbrace{\fbox{\raisebox{0ex}[2\height]{$\alpha^{(1)}\overrightarrow{e}_1^{(1)}$,}}}^{n_{1}}
\overbrace{~~\fbox{\raisebox{0ex}[2\height]{$0^{n_{1}}$,}}~~}^{n_{1}}
\end{array}
\]

You see the result is not so good ...

Hi guys,

I have a question about how to make the overbrace line up on the same horizental. See the attached example. You can see because of the exponent, the overbrace over these components cannot be aligned. Can anyone have some good idea to sort it out? Many thanks

BTW, why can't I post the ...