# 电子书中的排版数学¶

Calibre电子书阅读器能够显示嵌入在电子书(EPUB和HTML文件)中的数学。您可以直接使用TeX、MathML或AsciiMath来排版数学。Calibre电子书阅读器使用优秀的MathJax<https://www.mathjax.org>_书库来实现这一点。这是一个简短的教程，介绍如何使用数学制作电子书，并与优秀的电子书阅读器配合使用。

## 带有数学公式的简单 HTML 文件¶

<script type="text/x-mathjax-config"></script>


<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>


<!DOCTYPE html>
<html>
<!-- Copyright (c) 2012 Design Science, Inc. -->
<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">
// This line adds numbers to all equations automatically, unless explicitly suppressed.
MathJax.tex = {tags: 'all'};
</script>

<style>
h1 {text-align:center}
h2 {
font-weight: bold;
background-color: #DDDDDD;
margin-top: 1.5em;
border-top: 3px solid #666666;
border-bottom: 2px solid #999999;
}
</style>
<body>

<h1>Sample Equations</h1>

<h2>The Lorenz Equations</h2>

<p>
\begin{align}
\dot{x} &amp; = \sigma(y-x) \label{lorenz}\\
\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>Inline Mathematics</h2>

<p>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>

<h2>References to equations</h2>

<p>Here is a reference to the Lorenz Equations (\ref{lorenz}). Clicking on the equation number will take you back to the equation.</p>

</body>
</html>


The calibre E-book viewer supports MathML as well as TeX, but you must include the <script type="text/x-mathjax-config"></script> line in your HTML file otherwise the MathML will not render.