Here, the definitions of N-set, Z-set and N*-set need to be clear:
1, n set: the set of all non-negative integers is usually called non-negative integer set (or natural number set), and 0 belongs to n set;
2.Z set: the set of all integers is usually called integer set, and 0 belongs to Z set;
3.N* set: a set excluding 0 from the set of non-negative integers, and 0 does not belong to the N* set.
Extended data:
Operation of sets:
1, set the switching rule:
A∩B=B∩A
A∪B=B∪A
2, set associative law:
(A∩B)∩C=A∩(B∩C)
(A∪B)∪C=A∪(B∪C)
3, set the distribution law:
A∩(B∪C)=(A∪B)∩(A∪C)
A ∪( B∪C)=(A∪B)∪( A∪C)