Hi everyone,

I was wondering if someone felt inclined to give me a hand understanding a question that I'm stuck on? It's really bugging me because I think I'm missing something quite simple here!

The question is:

For each of the following subsets of , determine whether it can be written as a product of two subsets of . If it can, what are these subsets?

(i)

(ii)

(iii)

(iv)

As I said, I'm sure I'm missing something fairly simple but I'm really not sure what it is!

Thanks a lot in advance!