TeX Math

Inline math goes between $` characters, and display math in fenced code blocks with the info string math:

$ comrak -e math-code -t commonmark -t xml

Let $`x`$ and $`y`$ be integers such that

```math
x=y + 2
```

<p>Let <code data-math-style="inline">x</code> and <code data-math-style="inline">y</code> be integers such that</p>
<pre><code class="language-math" data-math-style="display">x=y + 2
</code></pre>

Let $`x`$ and $`y`$ be integers such that

```math
x=y + 2
```

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document SYSTEM "CommonMark.dtd">
<document xmlns="http://commonmark.org/xml/1.0">
  <paragraph>
    <text xml:space="preserve">Let </text>
    <math math_style="inline" xml:space="preserve">x</math>
    <text xml:space="preserve"> and </text>
    <math math_style="inline" xml:space="preserve">y</math>
    <text xml:space="preserve"> be integers such that</text>
  </paragraph>
  <code_block info="math" math_style="display" xml:space="preserve">x=y + 2
</code_block>
</document>

In inline math, it behaves just like inline code:

$ comrak -e math-code -t commonmark -t xml

This is math:$`2000`$.

<p>This is math:<code data-math-style="inline">2000</code>.</p>

This is math:$`2000`$.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document SYSTEM "CommonMark.dtd">
<document xmlns="http://commonmark.org/xml/1.0">
  <paragraph>
    <text xml:space="preserve">This is math:</text>
    <math math_style="inline" xml:space="preserve">2000</math>
    <text xml:space="preserve">.</text>
  </paragraph>
</document>

Note that math can contain embedded math:

$ comrak -e math-code -t commonmark -t xml

This is display math:

```math
\text{Hello $x^2$}
```
And this is inline math:
$`\text{Hello $x$ there!}`$

<p>This is display math:</p>
<pre><code class="language-math" data-math-style="display">\text{Hello $x^2$}
</code></pre>
<p>And this is inline math:
<code data-math-style="inline">\text{Hello $x$ there!}</code></p>

This is display math:

```math
\text{Hello $x^2$}
```

And this is inline math:
$`\text{Hello $x$ there!}`$

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document SYSTEM "CommonMark.dtd">
<document xmlns="http://commonmark.org/xml/1.0">
  <paragraph>
    <text xml:space="preserve">This is display math:</text>
  </paragraph>
  <code_block info="math" math_style="display" xml:space="preserve">\text{Hello $x^2$}
</code_block>
  <paragraph>
    <text xml:space="preserve">And this is inline math:</text>
    <softbreak />
    <math math_style="inline" xml:space="preserve">\text{Hello $x$ there!}</math>
  </paragraph>
</document>

Dollar signs are not required to be escaped with backslashes. They may be required to render the math properly, but it’s not required for parsing:

$ comrak -e math-code -t commonmark -t xml

$`\text{$}`$

<p><code data-math-style="inline">\text{$}</code></p>

$`\text{$}`$

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document SYSTEM "CommonMark.dtd">
<document xmlns="http://commonmark.org/xml/1.0">
  <paragraph>
    <math math_style="inline" xml:space="preserve">\text{$}</math>
  </paragraph>
</document>

Everything inside the math construct is treated as math, and not given its normal CommonMark meaning:

$ comrak -e math-code -t commonmark -t xml

$`b<a>c`$

<p><code data-math-style="inline">b&lt;a&gt;c</code></p>

$`b<a>c`$

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document SYSTEM "CommonMark.dtd">
<document xmlns="http://commonmark.org/xml/1.0">
  <paragraph>
    <math math_style="inline" xml:space="preserve">b&lt;a&gt;c</math>
  </paragraph>
</document>

Double dollar signs are not supported:

$ comrak -e math-code -t commonmark -t xml

$$`1 + 2`$$

<p>$$<code>1 + 2</code>$$</p>

\$\$`1 + 2`\$\$

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document SYSTEM "CommonMark.dtd">
<document xmlns="http://commonmark.org/xml/1.0">
  <paragraph>
    <text xml:space="preserve">$$</text>
    <code xml:space="preserve">1 + 2</code>
    <text xml:space="preserve">$$</text>
  </paragraph>
</document>