# flalign

Used for full-length aligned equations where the equations are spread out across the width of the page, allowing left alignment.

https://texform.dev/latex/environments/flalign

## Metadata

| Field | Value |
| --- | --- |
| Topic | [Alignment](https://texform.dev/latex/topics/alignment) |
| Packages | ams |
| Allowed mode | math |
| Tags | math-alignment |
| Commonality | medium |
| Body mode | math |

## Syntax

### ams

Argument specification: ``

Used for full-length aligned equations where the equations are spread out across the width of the page, allowing left alignment.

## Examples

```latex
\begin{flalign}a &= b\end{flalign}
```

[Open in Playground](https://play.texform.dev/?input=%5Cbegin%7Bflalign%7Da+%26%3D+b%5Cend%7Bflalign%7D)

```latex
\begin{flalign}a &= b & c &= d\end{flalign}
```

[Open in Playground](https://play.texform.dev/?input=%5Cbegin%7Bflalign%7Da+%26%3D+b+%26+c+%26%3D+d%5Cend%7Bflalign%7D)

## Renderer support

| Package | MathJax | KaTeX | XeTeX |
| --- | --- | --- | --- |
| ams | full | none | full |

## Usage frequency

0.09% of formulas in the measured corpus contain this entry, rank 19 of 31 entries with frequency data.

## In TeXForm

TeXForm reads the environment body in math mode.

## See also

- [flalign*](https://texform.dev/latex/environments/flalign-star)

## Test cases

### ams

| Input | Case | MathJax | KaTeX | XeTeX |
| --- | --- | --- | --- | --- |
| \begin{flalign} a & b \end{flalign} | Positive: baseline | Pass | Fail | Pass |