# Math (KaTeX)

Write LaTeX math directly in your card content. Single `$` for inline math, double `$$` for display math.

## Inline math

```
The quadratic formula: $x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$.
```

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

## Display math

```
$$\int_{a}^{b} f(x) \, dx = F(b) - F(a)$$
```

Renders as:

$$\int_{a}^{b} f(x) \, dx = F(b) - F(a)$$

## What's supported

KaTeX renders most LaTeX math primitives — fractions, integrals, sums, matrices, Greek letters, decorators. For anything KaTeX can't handle, MathJax is loaded as a fallback.

If math fails to render, it'll be left as plain text rather than crashing the card.