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-<head>
-<title>UK TeX FAQ -- question label dolldoll</title>
-</head><body>
-<h3>Why use <code>\</code><code>[</code> &#8230;<code>\</code><code>]</code> in place of <code>$$</code> &#8230;<code>$$</code>?</h3>
-<p/>LaTeX defines inline- and display-maths commands, apparently
-s those that derive from the TeX primitive maths
-sequences bracketing maths commands with single (or pairs of) dollar signs.
-<p/>As it turns out, LaTeX&#8217;s inline maths grouping,
-<code>\</code><code>(</code><code> ... </code><code>\</code><code>)</code>, has precisely the same effect as the
-TeX primitive version <code>$ ... $</code>. (Except that
-the LaTeX version checks to ensure you don&#8217;t put <code>\</code><code>(</code> and
-<code>\</code><code>)</code> the wrong way round.)
-<p/>In this circumstance, one often finds LaTeX users, who have some
-experience of using Plain TeX, merely assuming that LaTeX&#8217;s
-display maths grouping <code>\</code><code>[</code><code> ... </code><code>\</code><code>]</code> may be replaced by
-the TeX primitive display maths <code>$$ ... $$</code>.
-<p/>Unfortunately, they are wrong: if LaTeX code is going to patch display
-maths, it can only do so by patching <code>\</code><code>[</code> and <code>\</code><code>]</code>. The most
-obvious way this turns up, is that the class option <code>fleqn</code>
-simply does not work for equations coded using
-<code>$$ ... $$</code>, whether you&#8217;re using the standard classes
-alone, or using package <i>amsmath</i>. Also, the <code>\</code><code>[</code> and
-<code>\</code><code>]</code> construct has code for rationalising vertical spacing in some extreme
-cases; that code is not available in <code>$$ ... $$</code>, so if you
-use the non-standard version, you may occasionally observe
-inconsistent vertical spacing .
-<p/>There are more subtle effects (especially with package
-<i>amsmath</i>), and the simple rule is &#8220;use
-<code>\</code><code>[</code><code> ... </code><code>\</code><code>]</code> whenever displayed maths is needed in
-LaTeX&#8221;.
-<p/><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=dolldoll">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=dolldoll</a>
-</body>