I am new to TeX and am using scribtex to write a maths paper. When I put the followng code, the equation number is automatically displayed on the left, instead of in the right as is usually done. What is the problem and how do I fix it?

```
\documentclass[12pt,oneside]{amsart}
\usepackage{amssymb}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\begin{document}
Let us consider a spherical symmetric metric in curvature coordinates:
\begin{equation}
\label{metric}
ds^2=-e^\lambda dr^2-r^2(d\theta^2+\sin^2\theta d\phi^2)+e^\nu dt^2
\end{equation}
\end{document}
```

The output I get is

## Best Answer

Add the

`reqno`

document class option to your current file:This will override the default left equation numbering scheme of the

`amsart`

document class. The following, taken from the AMS document class documentation provides some background (p 7):