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| <title>Inserting Math (GNU Texinfo 6.8dev)</title> |
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| <div class="section-level-extent" id="Inserting-Math"> |
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| Next: <a href="Glyphs-for-Text.html" accesskey="n" rel="next">Glyphs for Text</a>, Previous: <a href="Inserting-Subscripts-and-Superscripts.html" accesskey="p" rel="prev"><code class="code">@sub</code> and <code class="code">@sup</code>: Inserting Subscripts and Superscripts</a>, Up: <a href="Insertions.html" accesskey="u" rel="up">Special Insertions</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Command-and-Variable-Index.html" title="Index" rel="index">Index</a>]</p> |
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| <h3 class="section" id="g_t_0040math-and-_0040displaymath_003a-Formatting-Mathematics">11.7 <code class="code">@math</code> and <code class="code">@displaymath</code>: Formatting Mathematics</h3> |
| |
| <a class="anchor" id="math"></a><a class="index-entry-id" id="index-math"></a> |
| <a class="index-entry-id" id="index-Mathematical-expressions_002c-inserting"></a> |
| <a class="index-entry-id" id="index-Formulas_002c-mathematical"></a> |
| <p>You can write a short mathematical expression with the <code class="code">@math</code> |
| command. Write the mathematical expression between braces, like this: |
| </p> |
| <div class="example"> |
| <pre class="example-preformatted">@math{\sin 2\pi \equiv \cos 3\pi} |
| </pre></div> |
| |
| <p>which looks like this: |
| </p><div class="display"> |
| <pre class="display-preformatted"><em class="math">\sin 2\pi \equiv \cos 3\pi</em> |
| </pre></div> |
| |
| <p>The <code class="code">@math</code> command has no special effect on the Info |
| output or (by default) the HTML output, merely outputting |
| the contents verbatim. |
| </p> |
| <p>For the TeX output, <code class="code">@math</code> switches into math mode. |
| This allows you to use all the |
| plain TeX math control sequences for symbols, functions, and so on, |
| starting with ‘<samp class="samp">\</samp>’. It’s best to use ‘<samp class="samp">\</samp>’ instead of ‘<samp class="samp">@</samp>’ |
| for any such mathematical commands; otherwise, <code class="command">texi2any</code> |
| will complain. |
| </p> |
| <a class="index-entry-id" id="index-Math-output-for-HTML"></a> |
| <p>By default, the HTML output is only enclosed by <code class="code"><em></code>. |
| <code class="command">texi2any</code> provides three options for displaying properly |
| formatted mathematics for HTML. You can select these with the |
| <code class="code">HTML_MATH</code> variable (see <a class="pxref" href="HTML-Customization-Variables.html">HTML Customization Variables</a>). |
| With <code class="code">HTML_MATH</code> set to ‘<samp class="samp">l2h</samp>’, <code class="command">texi2any</code> attempts |
| to use the <code class="command">latex2html</code> program to produce image files for |
| mathematical material. With the ‘<samp class="samp">t4h</samp>’ setting, <code class="command">texi2any</code> |
| attempts to use the <code class="command">tex4ht</code> program. With the ‘<samp class="samp">mathjax</samp>’ |
| setting, <code class="command">texi2any</code> inserts references in the output files |
| to MathJax scripts to format the material. The MathJax option |
| requires JavaScript to be enabled in the browser to work. See also |
| <a class="ref" href="MathJax-Customization-Variables.html">MathJax Customization Variables</a> and <a class="ref" href="latex2html-Customization-Variables.html"><code class="command">latex2html</code> Customization Variables</a>. |
| </p> |
| <a class="index-entry-id" id="index-Displayed-equations"></a> |
| <a class="index-entry-id" id="index-Equations_002c-displayed"></a> |
| <a class="index-entry-id" id="index-displaymath"></a> |
| <p>For displayed equations, you can use the <code class="code">@displaymath</code> |
| command. Example: |
| </p> |
| <div class="example"> |
| <pre class="example-preformatted">@displaymath |
| f(x) = {1\over\sigma\sqrt{2\pi}} |
| e^{-{1\over2}\left({x-\mu\over\sigma}\right)^2} |
| @end displaymath |
| </pre></div> |
| |
| <p>which produces: |
| </p> |
| <div class="displaymath"><em>f(x) = {1\over\sigma\sqrt{2\pi}} |
| e^{-{1\over2}\left({x-\mu\over\sigma}\right)^2} |
| </em></div> |
| <p>Although <code class="code">@sub</code> and <code class="code">@sup</code> may work inside math mode in |
| some contexts, it is better to use TeX’s ‘<samp class="samp">_</samp>’ and ‘<samp class="samp">^</samp>’ |
| characters to denote subscripts and superscripts within mathematical |
| expressions. In general, the contents of <code class="code">@math</code> or |
| <code class="code">@displaymath</code> should be plain TeX only, with no |
| interspersed Texinfo commands. |
| </p> |
| |
| <a class="index-entry-id" id="index-_005cmathopsup"></a> |
| <p>Due to the conflict with Texinfo’s <code class="code">@sup</code> command, you can access |
| the plain TeX command <code class="code">\sup</code> as <code class="code">\mathopsup</code> instead, |
| in the unlikely occurrence that you want to do this (but only when |
| processing with TeX, not with any of the <code class="code">HTML_MATH</code> options). |
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| Next: <a href="Glyphs-for-Text.html">Glyphs for Text</a>, Previous: <a href="Inserting-Subscripts-and-Superscripts.html"><code class="code">@sub</code> and <code class="code">@sup</code>: Inserting Subscripts and Superscripts</a>, Up: <a href="Insertions.html">Special Insertions</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Command-and-Variable-Index.html" title="Index" rel="index">Index</a>]</p> |
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