notes on relations
摘要：
Definition 1. Let A and B be sets. A binary relation from A to B is a subset of A X B.In other words, a binary relation from A to B is a set R of ordered pair in which the first element of each ordered pair comes from A and the second element comes from B. We use aRa to denote that (a, b) belongs to 阅读全文
posted @ 2012-09-17 19:22 Torstan 阅读(225) 评论(0) 推荐(0) 编辑
