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authorKarl Berry <karl@freefriends.org>2011-05-04 23:39:21 +0000
committerKarl Berry <karl@freefriends.org>2011-05-04 23:39:21 +0000
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parent9a8f00b89c2c1cd283f5fd0fb54959ef0690646f (diff)
FAQ-en 3.22 (4may11)
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-<head>
-<title>UK TeX FAQ -- question label nodollar</title>
-</head><body>
-<h3>&#8220;Missing <code>$</code> inserted&#8221;</h3>
-<p/>There are certain things that <em>only</em> work in maths mode. If your
-document is not in maths mode and you have an <code>_</code> or a <code>^</code> character,
-TeX (and by inheritance, LaTeX too) will say
-<pre>
-! Missing $ inserted
-</pre>
-as if you couldn&#8217;t possibly have misunderstood the import of what you
-were typing, and the only possible interpretation is that you had
-committed a typo in failing to enter maths mode. TeX, therefore,
-tries to patch things up by inserting the <code>$</code> you &#8216;forgot&#8217;, so that
-the maths-only object will work; as often as not this will land you in
-further confusion.
-<p/>It&#8217;s not just the single-character maths sub- and superscript
-operators: anything that&#8217;s built in or declared as a maths operation,
-from the simplest lower-case <code>\</code><code>alpha</code> through the inscrutable
-<code>\</code><code>mathchoice</code> primitive, and beyond, will provoke the error if
-misused in text mode.
-<p/>LaTeX offers a command <code>\</code><code>ensuremath</code>, which will put you in maths
-mode for the execution of its argument, if necessary: so if you want
-an <code>\</code><code>alpha</code> in your running text, say
-<code>\</code><code>ensuremath{<code>\</code><code>alpha</code>}</code>; if the bit of running text somehow
-transmutes into a bit of mathematics, the <code>\</code><code>ensuremath</code> will become
-a no-op, so it&#8217;s pretty much always safe.
-<p/><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=nodollar">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=nodollar</a>
-</body>