File: FAQ-atvert.html

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<head>
<title>UK TeX FAQ -- question label atvert</title>
</head><body>
<h3><code>\</code><code>spacefactor</code> complaints</h3>
<p>The errors
<pre>
! You can't use `\spacefactor' in vertical mode.
\@-&gt;\spacefactor 
                 \@m 
</pre>
or
<pre>
! You can't use `\spacefactor' in math mode.
\@-&gt;\spacefactor 
                 \@m 
</pre>
or simply
<pre>
! Improper \spacefactor.
...
</pre>
bites the LaTeX programmer who uses an internal command without taking
&ldquo;precautions&rdquo;.  The problem is discussed in detail in

&ldquo;<a href="FAQ-atsigns.html"><code>@</code> in macro names</a>&rdquo;,
together with solutions.
<p><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=atvert">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=atvert</a>
</body>