摘要
由集族的对称差给出了集族存在唯一的相异代表系的一个必要条件 。
This paper gives a necessary condition for only a system of distinct representaives existed in sets by sets' symmetric difference,revealing the relation between the symmetric difference and the system of distinct representatives of sets.
出处
《许昌师专学报》
2000年第2期13-14,共2页
Journal of Xuchang Teachers College(Social Science Edition)
关键词
对称差
相异代表系
积和式
集族
必要条件
symmetric difference
system of distinct representatives
permanent
