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diff --git a/Master/texmf-dist/doc/generic/FAQ-en/html/FAQ-braket.html b/Master/texmf-dist/doc/generic/FAQ-en/html/FAQ-braket.html new file mode 100644 index 00000000000..a43bde32fba --- /dev/null +++ b/Master/texmf-dist/doc/generic/FAQ-en/html/FAQ-braket.html @@ -0,0 +1,32 @@ +<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’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> <expression> </code><code>\</code><code>right)</code> — 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’s original need some +support. Donald Arseneau’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> |