Set Expressions

So im learning about set expressions such as ( INSERT(x,A), MEMBER(x,A), MAX(x,A), FIND(x,A)) and i cant find one website that shows if x or a were just integer numbers. I hope someone can clarify for me, thanks.Write your question here.
im learning about set expressions

"set" you say. What set are you talking about?
Does not look like std::set.
Abstract concept of a set? Pseudo-code?

Where did you find those expressions?
What are they supposed to do?
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