[commons-numbers] 03/04: Add Stirling number of the first kind to the user guide

[ah...@apache.org]

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aherbert pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/commons-numbers.git

commit 517b60d4db51eb60274c879850804abf1e779d67
Author: aherbert <ah...@apache.org>
AuthorDate: Wed Nov 9 12:27:30 2022 +0000

    Add Stirling number of the first kind to the user guide
---
 src/site/apt/userguide/index.apt | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/site/apt/userguide/index.apt b/src/site/apt/userguide/index.apt
index c7c3f672..f140f894 100644
--- a/src/site/apt/userguide/index.apt
+++ b/src/site/apt/userguide/index.apt
@@ -295,7 +295,10 @@ list.forEach(c -> System.out.println(Arrays.toString(c)));
 [3, 4, 5]
 +------------------------------------------+
 
-  The <<<Stirling>>> class can evaluate Stirling numbers of the second kind \( S(n, k) \). This is
+  The <<<Stirling>>> class can evaluate Stirling numbers of the first kind and second kind.
+  The Stirling numbers of the first kind \( s(n, k) \) arise in the study of permutations,
+  particularly counting the permutations of a set according to their number of cycles.
+  The Stirling number of the second kind \( S(n, k) \) is
   the number of ways of partitioning a set of \( n \) elements into \( k \) non-empty subsets.
   For example a set of 3 elements may be partitioned into: