copy from https://github.com/GitbookIO/plugin-katex, but support inline formula.

Math typesetting using KaTex

Use it for your book, by adding to your book.json:

{
    "plugins": ["katex"]
}

then run gitbook install.

Usage

Inline math: $\int_{-\infty}^\infty g(x) dx $

You need to put a space before $.

Block math:

$$ \int_{-\infty}^\infty g(x) dx $$

input $

The plugin uses $ to indicate inline formulas. If you want to only input a $, you can use \$``( in code mode),