Math & Science ⇒ Curly Braces in Equation

[Amitavo Roy]

I am new with LaTeX. I don't understand why this code line is not working.

Code: Select all

\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}

Please suggest me

[localghost]

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

\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).


Basic reading:

• LaTeX Resources for Beginners

Further reading:

• The »Math mode« document

Thorsten

[Amitavo Roy]

Thanks a lot, localghost.

Now it is perfect.