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44 lines
870 B
Markdown
44 lines
870 B
Markdown
# Function stirlingS2
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The Stirling numbers of the second kind, counts the number of ways to partition
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a set of n labelled objects into k nonempty unlabelled subsets.
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stirlingS2 only takes integer arguments.
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The following condition must be enforced: k <= n.
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If n = k or k = 1, then s(n,k) = 1
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## Syntax
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```js
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math.stirlingS2(n, k)
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```
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### Parameters
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Parameter | Type | Description
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--------- | ---- | -----------
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`n` | Number | BigNumber | Total number of objects in the set
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`k` | Number | BigNumber | Number of objects in the subset
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### Returns
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Type | Description
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---- | -----------
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Number | BigNumber | S(n,k)
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## Examples
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```js
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math.stirlingS2(5, 3); //returns 25
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```
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## See also
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[Bell numbers](Bell numbers.md)
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