从n个不同元素中任取r(r≦n)个元素排成一列(考虑元素先后出现次序)称此为一个排列,此种排列的总数即为排列数,即叫做从n个不同元素中取出r个元素的排列数。
... random permutations 随机排列 number of permutations 排列数 permutations and combinations 排列和组合 ; 组合 ...
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这些连接的可能排列数比宇宙中的粒子数还要多。
The possible permutations of those connections are more than there are particles in the universe.
一定维数时空的全息性完全等价于一个量子位的排列数全息性。
A certain dimensional space-time holographic is fully equivalent to the arrangement of a number of quantum bits holographic.
变更错排问题的限制条件,利用棋子多项式的性质建立递推关系,推出两个问题的排列数公式。
The limited condition of alternate permutation to utilize character of chessman polgnomial sets up recurrence relations and educes two math question about formula of permutation figure.
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