I had to change my document class to **revtex4-1** to be able to have `\widetext`

parameter for one of my equation, discussion about implementation. However, the abstract `\begin{abstract}...\end{abstract}`

is not supported by this class.

My minimal code

`\documentclass[twocolumn]{revtex4-1} \begin{document} \title{Hello world} \maketitle \begin{abstract} % abstract The maximal \end{abstract} \end{document} `

I get the errors

`./article.tex:84: LaTeX Error: Environment abstract undefined. See the LaTeX manual or LaTeX Companion for explanation. Type H <return> for immediate help. ... l.6 \begin{abstract} % abstract ./article.tex:8: LaTeX Error: \begin{document} ended by \end{abstract}. See the LaTeX manual or LaTeX Companion for explanation. Type H <return> for immediate help. ... l.8 \end{abstract} `

**How can you have abstract in revtex4-1?** or **How can you have widetext in ***article* document class?

## Answers

`revtex4-1`

loads, amongst other packages, `ltxfront`

to set up the front matter of the document. The following is taken from the Author's guide for `revtex4-1`

(section **IV.4. The abstract**, p 7; part of section **IV. The Front Matter**):

**IV.4. The abstract**

An abstract for a paper is specified by using the `abstract`

environment:

```
\begin{abstract}
Text of abstract
\end{abstract}
```

Note that in REVTeX 4.1 the abstract must be specified before the `\maketitle`

command and there is no need to embed it in an explicit `minipage`

environment.

So, use

```
\documentclass[twocolumn]{revtex4-1}% http://ctan.org/pkg/revtex4-1
\begin{document}
\title{Hello world}
\begin{abstract} % abstract
The maximal
\end{abstract}
\maketitle
\end{document}
```

It becomes apparent that `abstract`

doesn't exist after a call to `\maketitle`

when viewing the definition of `\[email protected]`

in `ltxfront.dtx`

:

```
\def\[email protected]{%
\@[email protected]
\[email protected]\[email protected]
\suppressfloats[t]%
\let\and\relax
\let\affiliation\@gobble
\let\author\@gobble
\let\@[email protected]\@empty
\let\@[email protected]\@empty
\let\@[email protected]\@empty
\let\@[email protected]\@[email protected]@error
\let\email\@gobble
\let\@address\@empty
\let\maketitle\relax
\let\thanks\@gobble
\let\abstract\@undefined\let\endabstract\@undefined% ABSTRACT definitions removed
\[email protected]{%
\vfil
\clearpage
}{}%
}%
```