permutation group

《近世代数》 · 第 40 页

$n$元对称群$S_$的任一子群称为$n$元置换群.

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《Lecture Notes on Bayesian Estimation and Classification》 · 第 31 页 · Section 1.6「Permutation Groups and Group Actions」

If $X$ is a nonempty set, a subgroup $G$ of the symmetric group $\operatorname{Sym}X$ is called a permutation group on $X$. The degree of the permutation group is the cardinality of $X$.