Math Equations

CreatedMar 22, 2026Takeshi Takatsudo

KaTeX math equation support for inline, block, and fenced code block math.

When math is enabled in settings (default: true), you can render mathematical equations using KaTeX.

Inline Math

Use single dollar signs to embed math within a line of text.

The formula $E = mc^2$ is inline.

The formula $E = mc^2$ is inline.

Use double dollar signs to render a centered display equation.

\int_{-\infty}^{\infty} e^{-x^2} dx = \sqrt{\pi}

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

Use a fenced code block with the math language identifier.

\nabla \times \mathbf{E} = -\frac{\partial \mathbf{B}}{\partial t}

```math
\nabla \times \mathbf{E} = -\frac{\partial \mathbf{B}}{\partial t}
```

Math support is controlled by the math setting in src/config/settings.ts:

export const settings = {
  // ...
  math: true, // enabled by default
};

x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}

$$
x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}
$$

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

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

\begin{bmatrix} a & b \\ c & d \end{bmatrix} \begin{bmatrix} x \\ y \end{bmatrix} = \begin{bmatrix} ax + by \\ cx + dy \end{bmatrix}

$$
\begin{bmatrix}
a & b \\
c & d
\end{bmatrix}
\begin{bmatrix}
x \\
y
\end{bmatrix}
=
\begin{bmatrix}
ax + by \\
cx + dy
\end{bmatrix}
$$