How can I insert a bracket on top or below a sum?

Question

I would like to insert brackets around a sum to signal the number of terms inside like we sometimes do in mathematics. I drew a picture:

enter image description here

The bracket can be either on top or bottom. Is there any way to do this in LaTeX?

Your cited image shows something 1/2 overbracket, half overbrace. For a pure overbrace, there is \overbrace{c+d+e+f+...+i}^{8/a}. I know there are other questions on this site that pertain to overbraces, unless the symbol you seek to overset is unusual in design. — Steven B. Segletes, Sep 15 '13 at 20:43
I believe that an overbrace is asked for and the similarity to a bracket is just an artifact of the drawing. — egreg, Sep 15 '13 at 21:04

Mensch · Answer 1 · 2013-09-15T21:52:29.920

2

Try it this way:

\documentclass{scrartcl}
\usepackage{amsmath}

\begin{document}

\begin{equation}
\overbrace{c+d+e+f+\dots+i}^{8/a} \quad
\underbrace{c+d+e+f+\dots+i}_{8/a}
\end{equation}

\end{document}

Result: enter image description here

edited Sep 15 '13 at 21:52

answered Sep 15 '13 at 20:48

Mensch

65,388

I think \(c)dots would be more appropriate here. mathtools provides the \overbracket/\underbracket version. – Qrrbrbirlbel Sep 15 '13 at 20:57
3

Just use \dots; amsmath knows which kind of dots are good for this case. – egreg Sep 15 '13 at 21:03

How can I insert a bracket on top or below a sum?

1 Answers1