permutation
英 [pɜːmjʊ'teɪʃ(ə)n]
美['pɝmjʊ'teʃən]
- n. [数] 排列；[数] 置换
词态变化
复数: permutations;
助记提示
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。
中文词源
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。
英文词源
- 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).
双语例句
- 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.
来自辞典例句
- 2. Such a permutation is called a derangement.
- 这样的一个排列称为错位排列.
来自辞典例句
- 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.
来自辞典例句
- 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.
来自辞典例句
- 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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