Math (KaTeX)

KaTeX is a fast math typesetting library that renders LaTeX syntax to beautiful equations. Unmarkdown supports both inline and block math expressions. KaTeX is available on all plans with no restrictions.

Wrap LaTeX expressions in single dollar signs to render inline math, which flows naturally within a paragraph.

The quadratic formula is $x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$ where $a \neq 0$.

The area of a circle is $A = \pi r^2$.

Use double dollar signs for display-mode equations that render as centered blocks on their own line.

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

You can also use a fenced code block with the math language identifier:

```math
\sum_{n=1}^{\infty} \frac{1}{n^2} = \frac{\pi^2}{6}
```

Frequently used KaTeX commands:

• Fractions: \frac{numerator}{denominator}
• Exponents and subscripts: x^2, x_i, x_{n+1}
• Square roots: \sqrt{x}, \sqrt[3]{x}
• Greek letters: \alpha, \beta, \gamma, \theta, \pi, \sigma, \lambda, \omega
• Summation: \sum_{i=1}^{n} x_i
• Products: \prod_{i=1}^{n} x_i
• Integrals: \int_{a}^{b}, \iint, \oint
• Limits: \lim_{x \to \infty} f(x)

Several matrix environments are supported with different bracket styles:

Parentheses: $\begin{pmatrix} a & b \\ c & d \end{pmatrix}$

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

No brackets: $\begin{matrix} a & b \\ c & d \end{matrix}$

Use the cases environment for piecewise-defined functions.

$$
f(x) = \begin{cases}
  x^2 & \text{if } x \geq 0 \\
  -x & \text{if } x < 0
\end{cases}
$$

Use the aligned environment to align multi-line equations at a specific point (usually the equals sign).

$$
\begin{aligned}
  2x + 3y &= 7 \\
  x - y &= 1
\end{aligned}
$$

Dollar Signs in Non-Math Contexts

To display a literal dollar sign without triggering math mode, escape it with a backslash.

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Math in Table Cells

Inline math works inside table cells. Use single dollar signs.

| Function | Formula |
|----------|---------|
| Area     | $A = \pi r^2$ |
| Volume   | $V = \frac{4}{3}\pi r^3$ |

Math in Headings

Inline math can be used in headings, though complex expressions may affect heading readability.

## The $\chi^2$ Distribution

When editing in the preview pane, KaTeX equations preserve their LaTeX source via the data-latex attribute. This means equations round-trip correctly between the markdown editor and the visual preview without losing the original LaTeX syntax.

KaTeX supports most standard LaTeX math commands. For a complete list of supported functions, operators, and symbols, see the KaTeX supported functions reference.