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# Function setUnion

Create the union of two (multi)sets.
Multi-dimension arrays will be converted to single-dimension arrays before the operation.


## Syntax

```js
math.setUnion(set1, set2)
```

### Parameters

Parameter | Type | Description
--------- | ---- | -----------
`a1` | Array &#124; Matrix | A (multi)set
`a2` | Array &#124; Matrix | A (multi)set

### Returns

Type | Description
---- | -----------
Array &#124; Matrix | The union of two (multi)sets


## Examples

```js
math.setUnion([1, 2, 3, 4], [3, 4, 5, 6])            // returns [1, 2, 3, 4, 5, 6]
math.setUnion([[1, 2], [3, 4]], [[3, 4], [5, 6]])    // returns [1, 2, 3, 4, 5, 6]
```


## See also

[setIntersect](setIntersect.md),
[setDifference](setDifference.md)