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hecheng
- 设关系A是从集合X={1,2,….,n}到集合Y={1,2,…..,m}的二元关系,而关系B是从集合Y到集合Z={1,2,….,p}的二元关系,求A与B的合成关系C。-A relationship is established from the set X = (1,2, ...., N) to the collection Y = (1,2, ... .., m) of binary relations, the relationship B is from a collection of Y