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。

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The permutation law and decision method of prime number is an important question of the number theory.

素数的排列规律和鉴别方法一直是数论中研究的重要问题之一。

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In the nineteenth century, the system of algebraic knowledge is enormous, which contains the permutation group, matrix, algebraic number theory, algebraic geometry and other branches.

十九世纪的代数学知识体系庞大，它包含置换群、矩阵、代数数论、代数几何等多个分支。

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