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Add documentation on maths in ebooks

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Kovid Goyal 2012-08-18 22:35:01 +05:30
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<!DOCTYPE html>
<html>
<!-- Copyright (c) 2012 Design Science, Inc. -->
<head>
<title>Math Test Page</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
<!-- This script tag is needed to make calibre's ebook-viewer recpgnize that this file needs math typesetting -->
<script type="text/x-mathjax-config"></script>
<style>
h1 {text-align:center}
h2 {
font-weight: bold;
background-color: #DDDDDD;
padding: .2em .5em;
margin-top: 1.5em;
border-top: 3px solid #666666;
border-bottom: 2px solid #999999;
}
</style>
</head>
<body>
<h1>Sample Equations</h1>
<blockquote>
<h2>The Lorenz Equations</h2>
<p>
\begin{align}
\dot{x} &amp; = \sigma(y-x) \\
\dot{y} &amp; = \rho x - y - xz \\
\dot{z} &amp; = -\beta z + xy
\end{align}
</p>
<h2>The Cauchy-Schwarz Inequality</h2>
<p>\[
\left( \sum_{k=1}^n a_k b_k \right)^{\!\!2} \leq
\left( \sum_{k=1}^n a_k^2 \right) \left( \sum_{k=1}^n b_k^2 \right)
\]</p>
<h2>A Cross Product Formula</h2>
<p>\[
\mathbf{V}_1 \times \mathbf{V}_2 =
\begin{vmatrix}
\mathbf{i} &amp; \mathbf{j} &amp; \mathbf{k} \\
\frac{\partial X}{\partial u} &amp; \frac{\partial Y}{\partial u} &amp; 0 \\
\frac{\partial X}{\partial v} &amp; \frac{\partial Y}{\partial v} &amp; 0 \\
\end{vmatrix}
\]</p>
<h2>The probability of getting \(k\) heads when flipping \(n\) coins is:</h2>
<p>\[P(E) = {n \choose k} p^k (1-p)^{ n-k} \]</p>
<h2>An Identity of Ramanujan</h2>
<p>\[
\frac{1}{(\sqrt{\phi \sqrt{5}}-\phi) e^{\frac25 \pi}} =
1+\frac{e^{-2\pi}} {1+\frac{e^{-4\pi}} {1+\frac{e^{-6\pi}}
{1+\frac{e^{-8\pi}} {1+\ldots} } } }
\]</p>
<h2>A Rogers-Ramanujan Identity</h2>
<p>\[
1 + \frac{q^2}{(1-q)}+\frac{q^6}{(1-q)(1-q^2)}+\cdots =
\prod_{j=0}^{\infty}\frac{1}{(1-q^{5j+2})(1-q^{5j+3})},
\quad\quad \text{for $|q|&lt;1$}.
\]</p>
<h2>Maxwell's Equations</h2>
<p>
\begin{align}
\nabla \times \vec{\mathbf{B}} -\, \frac1c\, \frac{\partial\vec{\mathbf{E}}}{\partial t} &amp; = \frac{4\pi}{c}\vec{\mathbf{j}} \\
\nabla \cdot \vec{\mathbf{E}} &amp; = 4 \pi \rho \\
\nabla \times \vec{\mathbf{E}}\, +\, \frac1c\, \frac{\partial\vec{\mathbf{B}}}{\partial t} &amp; = \vec{\mathbf{0}} \\
\nabla \cdot \vec{\mathbf{B}} &amp; = 0
\end{align}
</p>
<h2>In-line Mathematics</h2>
<p>Finally, while display equations look good for a page of samples, the
ability to mix math and text in a paragraph is also important. This
expression \(\sqrt{3x-1}+(1+x)^2\) is an example of an inline equation. As
you see, equations can be used this way as well, without unduly
disturbing the spacing between lines.</p>
</blockquote>
</body>
</html>

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manual/tutorials.rst
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regexp
server
creating_plugins
typesetting_math

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.. include:: global.rst
.. _typesetting_math:
Typesetting Math in ebooks
============================
The |app| ebook viewer has the ability to display math embedded in ebooks (ePuB
and HTML files). You can typeset the math directly with TeX or MathML or
AsciiMath. The |app| viewer uses the excellent `MathJax
<http://www.mathjax.org>`_ library to do this. This is a brief tutorial on
creating ebooks with math in them that work well with the |app| viewer.
A simple HTML file with mathematics
======================================
You can write mathematics inline inside a simple HTML file and the |app| viewer
will render it into properly typeset mathematics. In the example below, we use
TeX notation for mathematics. You will see that you can use normal TeX
commands, with the small caveat that ampersands and less than and greater than
signs have to be written as &amp; &lt; and &gt; respectively.
The first step is to tell |app| that this will contains maths. You do this by
adding the following snippet of code to the <head> section of the HTML file::
<script type="text/x-mathjax-config"></script>
That's it, now you can type mathematics just as you would in a .tex file. For
example, here are Lorentz's equations::
<h2>The Lorenz Equations</h2>
<p>
\begin{align}
\dot{x} &amp; = \sigma(y-x) \\
\dot{y} &amp; = \rho x - y - xz \\
\dot{z} &amp; = -\beta z + xy
\end{align}
</p>
This snippet looks like the following screen shot in the |app| viewer.
.. figure:: images/lorentz.png
:align: center
:guilabel:`The Lorentz Equations`
The complete HTML file, with more equations and inline mathematics is
reproduced below. Also, a link the EPUB version, generated by converting the
HTML file to EPUB in |app|: `mathjax.epub <_static/mathjax.epub>`_.
.. literalinclude:: mathjax.html
:language: html
:emphasize-lines: 8,9,29-38

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src/calibre/ebooks/conversion/plugins/epub_output.py
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@ -388,7 +388,8 @@ class EPUBOutput(OutputFormatPlugin):
if not tag.text:
tag.getparent().remove(tag)
for tag in XPath('//h:script')(root):
if not tag.text and not tag.get('src', False):
if (not tag.text and not tag.get('src', False) and
tag.get('type', None) != 'text/x-mathjax-config'):
tag.getparent().remove(tag)
for tag in XPath('//h:body/descendant::h:script')(root):
tag.getparent().remove(tag)