设集合A={1, 2, 3}, 不是A上的等价关系。
A、 {(1, 1), (2, 2), (3, 3)}
B、 {(1, 1), (2, 2), (3, 3), (1, 3), (3, 1)}
C、 {(1, 1), (2, 2), (3, 3), (2, 3)}
D、 {(1, 1), (2, 2), (2, 3), (3, 2), (2, 1), (1, 2), (3, 3), (1, 3), (3, 1)}
发布时间:2024-04-12 19:38:05
A、 {(1, 1), (2, 2), (3, 3)}
B、 {(1, 1), (2, 2), (3, 3), (1, 3), (3, 1)}
C、 {(1, 1), (2, 2), (3, 3), (2, 3)}
D、 {(1, 1), (2, 2), (2, 3), (3, 2), (2, 1), (1, 2), (3, 3), (1, 3), (3, 1)}