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+<head>
+<title>UK TeX FAQ -- question label braket</title>
+</head><body>
+<h3>Set specifications and Dirac brackets</h3>
+<p/>One of the few glaring omissions from TeX&rsquo;s mathematical
+typesetting capabilities is a means of setting separators in the
+middle of mathematical expressions. TeX provides primitives called
+<code>\</code><code>left</code> and <code>\</code><code>right</code>, which can be used to modify brackets (of
+whatever sort) around a mathematical expression, as in:
+
+<code>\</code><code>left(</code><code> &lt;expression&gt; </code><code>\</code><code>right)</code> &mdash; the size of the
+parentheses is matched to the vertical extent of the expression.
+<p/>However, in all sorts of mathematical enterprises one may find oneself
+needing a <code>\</code><code>middle</code> command, to be used in expressions like
+<blockquote>
+<pre>
+\left\{ x \in \mathbb{N} \middle| x \mbox{ even} \right\}
+</pre>
+
+</blockquote><p>
+to specify the set of even natural numbers. The
+<a href="FAQ-etex.html">e-TeX system</a>
+defines just such a command, but users of Knuth&rsquo;s original need some
+support. Donald Arseneau&rsquo;s <i>braket</i> package provides commands
+for set specifications (as above) and for Dirac brackets (and bras and
+kets). The package uses the e-TeX built-in command if it finds
+itself running under e-TeX.
+<dl>
+<dt><tt><i>braket.sty</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/misc/braket.sty">macros/latex/contrib/misc/braket.sty</a>
+</dl>
+<p/><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=braket">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=braket</a>
+</body>