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## Curly Braces in Equation

equationsmath-modemathematicsAdd tags Information and discussion about LaTeX's math and science related features (e.g. formulas, graphs).

### Curly Braces in Equation

I am new with LaTeX. I don't understand why this code line is not working.
Code: Select all  •  Open in writeLaTeX
\begin{equation}\label{eq:4.20}\eta_{elec}=\left{\frac {\gamma_{j,in} - {\langle{\gamma_j}\rangle}_j} {\gamma_{j,in}-1}\right}\end{equation}

Last edited by cgnieder on Sun Apr 7th, 2013, edited 1 time in total.
Amitavo Roy

Posts: 14
Joined: Sat Apr 6th, 2013

### Re: Curly Braces in Equation

And please always provide a self-contained and minimal example to give an adequate problem description. Those who try to help are rarely motivated to write a complete example from scratch.

If you want curly braces in the output, you have to escape them by a backslash (\) and so make them a command. Curly braces are usually used for grouping so this measure is necessary to get them printed.

The actual error is caused by the fact that \left and \right expect a delimiter (braces, brackets, parentheses). otherwise they will produce error.
Code: Select all  •  Open in writeLaTeX
\documentclass[11pt]{article}\usepackage[T1]{fontenc}\usepackahe{mathtools}  % loads »amsmath«\begin{document}  \begin{equation}\label{eq:dummy}    \eta_text{elec}=\left\{\frac{\gamma_{j,in} - \langle\gamma_j\rangle_j}{\gamma_{j,in}-1}\right\}  \end{equation}\end{document}

For more clarity in your code you should avoid superfluous braces (see above).

Thorsten
LaTeX Community Moderator

¹ System: openSUSE 13.1 (Linux 3.11.10), TeX Live 2013 (vanilla), TeXworks 0.5 (r1351)
² Posting stopped indefinitely due to offenses

localghost
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Joined: Fri Feb 2nd, 2007
Location: Braunschweig, Germany

### Re: Curly Braces in Equation

Thanks a lot, localghost.

Now it is perfect.
Amitavo Roy

Posts: 14
Joined: Sat Apr 6th, 2013

### Topic Tags

equationsmath-modemathematics