Not equal, it should be said that the meanings of "or" and "and" are just the opposite in the mathematical set.

In other words, one of the two sets is enough. For example, x is an element of a or b set. Then the element where X is A meets the requirements, and the element where X is B also meets the requirements. Of course, X is an element of both A and B, or the union of A and B..

And it is to meet two sets at the same time. For example, X is an element of A and B, which means that X satisfies both A and B. If only one of them is satisfied, for example, A satisfies and B does not, it will not meet the requirements. And it is an intersection.

So they are two completely different operations.

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