The data compressing method based on constant grade makes use of permutation and combination theory.
常数级压缩方法利用排列组合原理，适于压缩字节内容无规律的文件。
Using gamma function, the paper popularized the common conceptions of the usual factorial, permutation and combination and proved some combination formulas in common use.
依照伽马函数，对通常的阶乘、排列、组合的概念进行了推广，并证明了一些常用的组合公式。
In these pictures, besides the embodiment, he also used the method of permutation and combination, he used the computer software to make seamless collage with cities images taken.
在这里，他移除了强加进去的“化身”，采取对现实进行了重新排列组合的方式，利用电脑软件对实拍的城市影像进行不露痕迹的拼贴。
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