# xalignat

Used for full-width AMS multiline alignment displays with an explicit integer count of aligned column pairs and normal equation numbering.

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

## Metadata

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

## Syntax

### ams

Argument specification: `m:I`

Used for full-width AMS multiline alignment displays with an explicit integer count of aligned column pairs and normal equation numbering.

## Examples

```latex
\begin{xalignat}{2} a&=b & c&=d \end{xalignat}
```

[Open in Playground](https://play.texform.dev/?input=%5Cbegin%7Bxalignat%7D%7B2%7D+a%26%3Db+%26+c%26%3Dd+%5Cend%7Bxalignat%7D)

## Renderer support

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

## In TeXForm

TeXForm reads the environment body in math mode.

## See also

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

## Test cases

### ams

| Input | Case | MathJax | KaTeX | XeTeX |
| --- | --- | --- | --- | --- |
| \begin{xalignat}{1} a & b \end{xalignat} | Positive: baseline | Pass | Fail | Pass |
| \begin{xalignat}1 a & b \end{xalignat} | Positive: bare[0] | Pass | Fail | Pass |
| \begin{xalignat}{a} a & b \end{xalignat} | Negative: neg:I[0] | Fail | Fail | Fail |