First: just in case I misinterpreted it - I'm using as 'not in'.

I'm actually (lol) having a bit of trouble with this than I expected (big surprise). Even without a venn diagram I can see that they are the same, and if you just look at their definitions they're the same (ie. { } which is the same as

since

is just ANOTHER bleeping way of saying AND). Sorry about the crassness, I've just been staring at these problems for a while now and I've realized that discrete and theory have simply killed my love of math.

OK. Back to the problem. I understood what Jhevon was saying, but I don't know how to 'show' something is a subset of something else.