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<a name="Inserting-Math"></a>
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<p>
Next: <a href="Glyphs-for-Text.html#Glyphs-for-Text" accesskey="n" rel="next">Glyphs for Text</a>, Previous: <a href="Inserting-Subscripts-and-Superscripts.html#Inserting-Subscripts-and-Superscripts" accesskey="p" rel="prev">Inserting Subscripts and Superscripts</a>, Up: <a href="Insertions.html#Insertions" accesskey="u" rel="up">Insertions</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Command-and-Variable-Index.html#Command-and-Variable-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="g_t_0040math_003a-Inserting-Mathematical-Expressions"></a>
<h3 class="section">12.7 <code>@math</code>: Inserting Mathematical Expressions</h3>
<a name="math"></a><a name="index-math"></a>
<a name="index-Mathematical-expressions_002c-inserting"></a>
<a name="index-Formulas_002c-mathematical"></a>
<p>You can write a short mathematical expression with the <code>@math</code>
command. Write the mathematical expression between braces, like this:
</p>
<div class="example">
<pre class="example">@math{(a + b) = (b + a)}
</pre></div>
<p>This produces the following in Info and HTML:
</p>
<div class="example">
<pre class="example">(a + b) = (b + a)
</pre></div>
<a name="index-MathML_002c-not-used"></a>
<p>The <code>@math</code> command has no special effect on the Info and HTML
output. <code>makeinfo</code> expands any @-commands as usual, but it
does not try to use produce good mathematical formatting in any way
(no use of MathML, etc.). The HTML output is enclosed by
<code><em>...</em></code>, but nothing more.
</p>
<a name="index-_005cmathopsup"></a>
<p>However, as far as the TeX output is concerned, plain TeX
mathematical commands are allowed in <code>@math</code>, starting with
‘<samp>\</samp>’. In essence, <code>@math</code> switches into plain TeX math
mode. (Exception: the plain TeX command <code>\sup</code>, which
typesets the mathematical operator name ‘sup’, must be accessed as
<code>\mathopsup</code>, due to the conflict with Texinfo’s <code>@sup</code>
command.)
</p>
<p>This allows you to use all the plain TeX math control sequences for
symbols, functions, and so on, and thus get proper formatting in the
TeX output, at least.
</p>
<p>The <code>@sub</code> and <code>@sup</code> commands described in the previous
section produce subscripts and superscripts in HTML output as well as
TeX; the plain TeX characters <code>_</code> and <code>^</code> for
subscripts and superscripts are recognized by TeX inside
<code>@math</code>, but do nothing special in HTML or other output formats.
</p>
<p>It’s best to use ‘<samp>\</samp>’ instead of ‘<samp>@</samp>’ for any such
mathematical commands; otherwise, <code>makeinfo</code> will complain.
On the other hand, <code>makeinfo</code> does allow input with matching
(but unescaped) braces, such as ‘<samp>k_{75}</samp>’; it complains about
such bare braces in regular input.
</p>
<p>Here’s an example:
</p>
<div class="example">
<pre class="example">@math{\sin 2\pi \equiv \cos 3\pi}
</pre></div>
<p>which looks like the input in Info and HTML:
</p><div class="example">
<pre class="example">\sin 2\pi \equiv \cos 3\pi
</pre></div>
<a name="index-_005c_005c-_0028literal-_005c-in-_0040math_0029"></a>
<p>Since ‘<samp>\</samp>’ is an escape character inside <code>@math</code>, you can
use <code>@\</code> to get a literal backslash (<code>\\</code> will work in
TeX, but you’d get the literal two characters ‘<samp>\\</samp>’ in Info).
<code>@\</code> is not defined outside of <code>@math</code>, since a ‘<samp>\</samp>’
ordinarily produces a literal (typewriter) ‘<samp>\</samp>’. You can also use
<code>@backslashchar{}</code> in any mode to get a typewriter backslash.
See <a href="Inserting-a-Backslash.html#Inserting-a-Backslash">Inserting a Backslash</a>.
</p>
<a name="index-Displayed-equations"></a>
<a name="index-Equations_002c-displayed"></a>
<p>For displayed equations, you must at present use TeX directly
(see <a href="Raw-Formatter-Commands.html#Raw-Formatter-Commands">Raw Formatter Commands</a>).
</p>
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<p>
Next: <a href="Glyphs-for-Text.html#Glyphs-for-Text" accesskey="n" rel="next">Glyphs for Text</a>, Previous: <a href="Inserting-Subscripts-and-Superscripts.html#Inserting-Subscripts-and-Superscripts" accesskey="p" rel="prev">Inserting Subscripts and Superscripts</a>, Up: <a href="Insertions.html#Insertions" accesskey="u" rel="up">Insertions</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Command-and-Variable-Index.html#Command-and-Variable-Index" title="Index" rel="index">Index</a>]</p>
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