# alignat*

Used for the unnumbered form of alignat when fixed aligned column pairs are needed without equation numbers.

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

## 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: `m:I`

Used for the unnumbered form of alignat when fixed aligned column pairs are needed without equation numbers.

## Examples

```latex
\begin{alignat*}{1}a&=b\end{alignat*}
```

[Open in Playground](https://play.texform.dev/?input=%5Cbegin%7Balignat*%7D%7B1%7Da%26%3Db%5Cend%7Balignat*%7D)

## Renderer support

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

## Usage frequency

0.04% of formulas in the measured corpus contain this entry, rank 22 of 31 entries with frequency data.

## In TeXForm

TeXForm reads the environment body in math mode.

## See also

- [alignat](https://texform.dev/latex/environments/alignat)
- [alignedat](https://texform.dev/latex/environments/alignedat)

## Test cases

### ams

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