I have a little problem in Latex, which can be easily corrected, but nonetheless I'd like to understand what is going on. Briefly, the problem is that in any document, if I include the abstract, all the main text turns to small size.   Here it is the MWE (BTW, the problem is not because of changing the font family, but font sizes are better distinguished this way):  \documentclass[a4paper, 12pt, notitlepage]{article}  \usepackage[english]{babel}  \usepackage[utf8]{inputenc} \renewcommand*\rmdefault{ppl}  \begin{document}  \abstract{Donec vel lacinia tellus, vel feugiat massa. Proin orci nibh, eleifend vel velit quis, semper faucibus purus. Vivamus ultrices urna eget orci feugiat, vitae elementum mi sagittis. Praesent dignissim mauris lacus, in rhoncus quam posuere sit amet. In hac habitasse platea dictumst. Nullam et interdum ante. Proin accumsan erat quam. Nunc nunc eros, tempor quis ante id, pharetra porttitor dui. Sed at enim lobortis, sagittis odio nec, ullamcorper nunc. Aenean varius vel mi ac dictum.}  \newpage     \section{Introduction}  {\small Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus lobortis iaculis gravida. Suspendisse et dapibus justo. Mauris faucibus massa augue, non placerat nunc faucibus vel. Suspendisse imperdiet sed tortor sed elementum. Nullam at purus imperdiet, dapibus nunc nec, tincidunt diam. Curabitur placerat nulla eu purus volutpat, id porta ipsum gravida. Suspendisse mi odio, euismod nec nulla at, convallis eleifend metus. Curabitur ac cursus nisi.}  Donec vel lacinia tellus, vel feugiat massa. Proin orci nibh, eleifend vel velit quis, semper faucibus purus. Vivamus ultrices urna eget orci feugiat, vitae elementum mi sagittis. Praesent dignissim mauris lacus, in rhoncus quam posuere sit amet. In hac habitasse platea dictumst. Nullam et interdum ante. Proin accumsan erat quam. Nunc nunc eros, tempor quis ante id, pharetra porttitor dui. Sed at enim lobortis, sagittis odio nec, ullamcorper nunc. Aenean varius vel mi ac dictum.  {\normalsize Maecenas a est accumsan, tempor mi nec, lacinia nisi. Morbi eleifend odio et mauris facilisis ultricies. Praesent ipsum magna, malesuada vitae euismod non, finibus ac magna. Sed tempus est eu libero hendrerit malesuada. Sed facilisis quam tristique, dignissim enim non, finibus felis. Integer ultricies ligula sit amet nulla bibendum, eget cursus sem fermentum. Duis auctor libero sed arcu pharetra, a ultrices orci pulvinar. Sed varius vehicula dolor non tincidunt.}  \end{document}   If I compile the code as it is, the page would look like this:    But if I comment out or delete the line of the abstract, it looks like this:    Anyone knows why is this happening?  Thanks!
In the article class, it seems that using the abstract environment has an effect to the rest of the document. More precisely, it seems that it redefines the \linewidth, which equals \textwidth without abstract, is smaller with the abstract. My feeling is that \linewidth is redefined for the abstract environment, but the value is not reseted at the end of the abstract.  Here is a minimal example:  \documentclass{article} \begin{document} \abstract{This is an abstract. This is an abstract.}\bigskip  This is text. This is text. This is text. This is text. This is text. This is text.\\  \rule{\textwidth}{3em} \rule{\linewidth}{3em} \end{document}   The output is not the same if you comment the \abstract line or not.  Do you have the same problem as I do when you compile (if not, I will upload some PDF files to show)? Is this a (known) bug in LaTeX2e? How can we circumvent the problem?  Note: I compile with the pdflatex command, and I use pdfTeX, Version 3.1415926-1.40.10 (TeX Live 2009/Debian).
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