The difference between AUB and AnB lies in different compositions, different inclusions and different elements.

I. Different composition

1, AUB:AUB is a set consisting of all elements belonging to set a or set b.

2.AnB:AnB is a set composed of all elements belonging to set A and set B. ..

Second, it contains different

1, AUB:AUB must contain both a and b.

2.AnB:AnB must be included in A and B.

Third, the number of elements is different.

1, aub: The number of elements of aub must be greater than or equal to the number of elements of A and greater than or equal to the number of elements of B. ..

2. ANB: The number of elements of ANB must be less than or equal to the number of elements A and less than or equal to the number of elements B. ..