Sets 集合

1 the set A, the set{a, b, c, d, e, f, g}

2 elements (members) of the set A

3 the set B, the set {u, v, w, x, y, z}

4 intersection of the saets A and B, A∩B={f, u, g}

5-6 union of the sets A and B, A∪B={a, b, c, d, e, f, g, u, v, w, x, y, z}

7 complement of the set B, B’={a, b, c, d, e}

8 complement of the set A, A’={ v, w, x, y, z}

9-11 mappings

9 mapping of the set M onto the set N

10 mapping of the set M into the set N

11 one to one mapping of the set M onto the set N