Take the 2-minute tour ×
TeX - LaTeX Stack Exchange is a question and answer site for users of TeX, LaTeX, ConTeXt, and related typesetting systems. It's 100% free, no registration required.

I would like to label an equation with an arbitrary symbol, rather than a number, or letter. Is this possible?

share|improve this question

3 Answers 3

up vote 30 down vote accepted

Perhaps something like this.

\documentclass[11pt,a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{mathtools}   % loads »amsmath«

\begin{document}
  \begin{equation}\label{eqn:einstein}
    E=mc^2\tag{*}
  \end{equation}
  \eqref{eqn:einstein}
\end{document}
share|improve this answer

With amsmath, you have two similar commands:

  • \tag{label} where label can be any text or symbol. Note, for most symbol mathmode is required, for example: \tag{$\star$}. Here the label would be typeset within parentheses.

  • \tag*{label}, in contrast, does not add parentheses, otherwise it works similar to \tag.

For further information have a look at the amsmath user's guide.

share|improve this answer

In addition to the answers about how to \tag equations with symbols, there are a number of packages that give you access to a bunch more symbols. Like pifont, ifsym, MarvoSym, bbding See p. 71 et seq. of the Comprehensive LaTeX symbols list for details.

For example:

\documentclass{article}
\usepackage{pifont}
\usepackage{amsmath}
\begin{document}
\[
E=mc^2 \label{eq:einstein} \tag{\ding{37}}
\]
As we can see from \eqref{eq:einstein}\ldots
\end{document}

Produces:

pifont image

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.