Math (KaTeX)

caution

KaTeX (remark-math + rehype-katex) is not currently configured in docusaurus.config.ts. The examples below are shown as latex source blocks rather than rendered math, because MDX otherwise tries to parse the curly braces in expressions like \frac{a}{b} as JS expressions and crashes.

Once KaTeX is wired up, swap each latex fence for the corresponding $$ ... $$ math fence.

Inline math (source)

$E = mc^2$

$\sum_{i=1}^{n} i = \frac{n(n+1)}{2}$

Display math (source)

$$
\int_{0}^{\infty} e^{-x^2}\, dx = \frac{\sqrt{\pi}}{2}
$$

Aligned equations (source)

$$
\begin{aligned}
  a^2 + b^2 &= c^2 \\
  (x + y)^2 &= x^2 + 2xy + y^2
\end{aligned}
$$

Matrix (source)

$$
\begin{bmatrix}
  1 & 0 & 0 \\
  0 & 1 & 0 \\
  0 & 0 & 1
\end{bmatrix}
$$

How to enable KaTeX

Add to docusaurus.config.ts:

import remarkMath from 'remark-math';
import rehypeKatex from 'rehype-katex';

presets: [
  ['classic', {
    docs: {
      remarkPlugins: [remarkMath],
      rehypePlugins: [rehypeKatex],
    },
  }],
],

stylesheets: [
  {
    href: 'https://cdn.jsdelivr.net/npm/katex@0.13.24/dist/katex.min.css',
    integrity: 'sha384-...',
    crossorigin: 'anonymous',
  },
],

After enabling, replace the latex fences on this page with $$ ... $$ for display math and inline $...$ for inline math.