摘要
研究四元同名元素不相邻可重复排列数F(a,b,c,d)的一般性质,获得了排列数F(a,a,a,a)和F(a,a,c,d)的递推公式以及F(1,1,c,d)的计算公式。
A sort of 4-element permutations with repetition allowed and the same elements not faced with each other are studied.The recurrence relationship in special conditions is found,and some special formulae are obtained as example using the recurrence relation.
出处
《长江大学学报（自科版）（上旬）》
2016年第11期5-8,共4页
JOURNAL OF YANGTZE UNIVERSITY (NATURAL SCIENCE EDITION) SCI ＆ ENG
基金
湖北省教育厅科研技术项目(B2014281)
关键词
可重复排列
同名元素不相邻
序串
4-element permutation with repetition
the same elements not faced with each other
cardinal number
recurrence relation
