Including abstract reduces the number of pages [duplicate]

Possible Duplicate:
The abstract environment changes the \linewidth for the whole document

I would like to know why when I introduce an abstract to my paper of (article type), the number of pages decreases, possibly changing the characters size.

-

marked as duplicate by Loop Space, Jake, lockstep, Marco Daniel, diabonasSep 17 '12 at 15:46

Can you provide a minimal example document where this happens? – Jake Sep 17 '12 at 14:36
@Jake Oh I think I know why, I was using \abstract{} and I think I should use instead \begin{abstract}{} \end{abstract} – inquisitor Sep 17 '12 at 14:38

The article class defines the abstract as environment:

\documentclass{article}
\begin{document}
\begin{abstract}
The abstract goes here.
\end{abstract}
\end{document}


The implementation of environments defines two commands \abstract for the \begin code and \endabstract for the \end code. Also a grouping level is inserted by \begin and \end. If you call \abstract directly, then the grouping level is missing and the begin code of environment abstract uses \small that remains active for the following text.

-