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Does "∨" in mathematics set mean "and" or "?
It means and, that is, and. On the other hand, it means or is to pay.

In general, the set of all elements belonging to A and B is called the intersection of A and B, and it is recorded as (pronounced "A over B").

In general, the set consisting of all elements belonging to A or B is called the union of A and B, and is recorded as "A and B".

Let a = {4 4,5,6,8} and b = {3 3,5,7,8}.

Then A crosses B = {5,8} (male * * *).

A and B = {3,4,5,6,7,8} (both are always * * * (a repetition))