[Mik3y]

I'm in a discrete mathematics course, based around logic, true/false, sets/subsets, etc. I am doing pretty well but I was hoping that someone here could help better define these symbols for me?

⊂

⊆

∈

I think I understand them, but it would be really helpful to hear someone else here describe it.

[Aus10]

third one is element. Usually elements deal with sets/subsets.

First one is complement. Usually meaning the opposite of.

Second one is subset.

GL!

[av00]

1: 'proper' subset of, e.g. {1, 2} ⊂ {1, 2, 3}
2: subset of, e.g. {1, 2, 3} ⊆ {1, 2, 3} (difference is simply that in the second definition it can also be equal to)
3: element of, e.g. 1 ∈ {1, 2, 3}

You'll find a lot more symbols in set theory, the most well known are probably union, intersection and complement.

[Younis Khan]

third one is a rip off of the fucking euro sign