# xalignat*

Used for the unnumbered form of xalignat, giving a full-width AMS multiline alignment display with an explicit integer count of aligned column pairs.

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

## 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 the unnumbered form of xalignat, giving a full-width AMS multiline alignment display with an explicit integer count of aligned column pairs.

## 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%3D+b+%26+c+%26%3D+d+%5Cend%7Bxalignat*%7D)

## Renderer support

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

## Usage frequency

0% of formulas in the measured corpus contain this entry, rank 30 of 31 entries with frequency data.

## In TeXForm

TeXForm reads the environment body in math mode.

## See also

- [xalignat](https://texform.dev/latex/environments/xalignat)
- [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 |