Question

What are the classifications of set? And what are the 2 ways of describing a set?

Answer 1

A set is just a collection of objects, whatever they may be.

Answer 2

Yeah, but what are their classifications?

Answer 3

Honestly, I have no idea. But for part two wiki does a great job:
There are two ways of describing, or specifying the members of, a set. One way is by intensional definition, using a rule or semantic description:

A is the set whose members are the first four positive integers.
B is the set of colors of the French flag.
The second way is by extension – that is, listing each member of the set. An extensional definition is denoted by enclosing the list of members in curly brackets:
C = {4, 2, 1, 3}
D = {blue, white, red}.

Answer 4

@satellite73 probably will know.

Answer 5

@bahrom7893 ok. thanks for the help anyway

Answer 6

By classifications do you mean countable and uncountable?

Answer 7

Could also be empty/non empty

Answer 8

I'm not really sure. Are there other set classifications used in algebra?