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Answers for “两个集合 A 和 B 之间的关系 R 的正式定义是什么？”

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Ordered pairs are used because the order of the elements matters in a relation. The first component of the pair is related to the second component, and swapping them can change whether the relationship holds.

Conditions: The relation is between two sets A and B.; The relationship is directional or asymmetric.

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