permutation
英 [p??mj?'te??(?)n]
美['p?mj?'te??n]
- n. [數(shù)] 排列；[數(shù)] 置換
暢通詞匯
詞態(tài)變化
復(fù)數(shù):?permutations;
助記提示
在數(shù)學(xué)的排列與組合中用 A 代表 Arrangement 表示“排列”（在舊教材為 P -> Permutation），用 C 代表 Combination 表示“組合”，所以如果你還記得排列與組合的計(jì)算公式的話，就一目了然了。
中文詞源
permutation 置換，排列組合
per-,完全的，-mut,改變，詞源同mutual,mutable.用于數(shù)學(xué)名詞置換，排列組合。
英文詞源
- 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).
雙語例句
- 1. Every sort of permutation and combination is possible in human nature.
- 火的本性可能有各種交織和組合的情況.
來自辭典例句
- 2. Such a permutation is called a derangement.
- 這樣的一個(gè)排列稱為錯(cuò)位排列.
來自辭典例句
- 3. Other enumeration problems lead us to the study of orbits of permutation groups.
- 其它的計(jì)數(shù)問題引導(dǎo)我們?nèi)パ芯恐脫Q群的軌道.
來自辭典例句
- 4. The permutation is even if the number of inversions it contains is even.
- 如果一個(gè)排列中含有的反序的個(gè)數(shù)是偶數(shù),則稱它為偶排列.
來自辭典例句
- 5. Unique because that particular permutation has not appeared before.
- 之所以獨(dú)一無二,是因?yàn)槟欠N獨(dú)特的基因排列組合以前不曾出現(xiàn)過.
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