permutation

英 [ˌpɜː.mjuːˈteɪ.ʃən]      美 [ˌpɝː.mjuːˈteɪ.ʃən]
  • n. [数] 排列;[数] 置换
星级词汇:
permutation
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在数学的排列与组合中用 A 代表 Arrangement 表示“排列”(在旧教材为 P -> Permutation),用 C 代表 Combination 表示“组合”,所以如果你还记得排列与组合的计算公式的话,就一目了然了。
permutation 置换,排列组合

per-,完全的,-mut,改变,词源同mutual,mutable.用于数学名词置换,排列组合。

permutation (n.)
mid-14c., from Old French permutacion "change, shift" (14c.), from Latin permutationem (nominative permutatio) "a change, alteration, revolution," noun of action from past participle stem of permutare "change thoroughly, exchange," from per- "thoroughly" (see per) + mutare "to change" (see mutable).
1. Every sort of permutation and combination is possible in human nature.
火的本性可能有各种交织和组合的情况.
2. Such a permutation is called a derangement.
这样的一个排列称为错位排列.
3. Other enumeration problems lead us to the study of orbits of permutation groups.
其它的计数问题引导我们去研究置换群的轨道.
4. The permutation is even if the number of inversions it contains is even.
如果一个排列中含有的反序的个数是偶数,则称它为偶排列.
5. Unique because that particular permutation has not appeared before.
之所以独一无二,是因为那种独特的基因排列组合以前不曾出现过.

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