# Function setIsSubset Check whether a (multi)set is a subset of another (multi)set. (Every element of set1 is the element of set2.) Multi-dimension arrays will be converted to single-dimension arrays before the operation. ## Syntax ```js math.setIsSubset(set1, set2) ``` ### Parameters Parameter | Type | Description --------- | ---- | ----------- `a1` | Array | Matrix | A (multi)set `a2` | Array | Matrix | A (multi)set ### Returns Type | Description ---- | ----------- boolean | true | false ### Throws Type | Description ---- | ----------- ## Examples ```js math.setIsSubset([1, 2], [3, 4, 5, 6]) // returns false math.setIsSubset([3, 4], [3, 4, 5, 6]) // returns true ``` ## See also [setUnion](setUnion.md), [setIntersect](setIntersect.md), [setDifference](setDifference.md)