Math & Science ⇒ how to use \tag command?

[bkarpuz]

Dear all,

I can't make the following code work, help me please.

Code: Select all

\documentclass[12pt,reqno]{article}

\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{amsmath}

\begin{document}
$$x^{2}+y^{2}<1\tag{*}$$
\end{document}

Please let me know what is missing/superfluous.

Thanks.

[Stefan Kottwitz]

Hi,

use the equation environment instead of $$...$$:

Code: Select all

\begin{equation}
  x^{2}+y^{2}<1\tag{*}
\end{equation}

Stefan

[bkarpuz]

Hmm, ty but isn't it possible to use something with $$...$$ to obtain a similar output?

Thanks.

[localghost]

Hmm, ty but isn't it possible to use something with $$...$$ to obtain a similar output? [...]

Take a look at l2tabu (Section 1.6 - Separating maths formulae from continuous text using $$...$$) to learn why not to use this kind of math mode.


Best regards
Thorsten