Hi all,

I am in my final year at University doing a horrible module called Fractals & Chaos (really it's called Applied Mathematics - even though I find it to be purely pure mathematics)

Now my main problem is the proofs of the module.. turns out it's more proof heavy than I ever imagined and my exam is very soon .. Shortly after the weekend.

First problem I have really is:

What is the image of a function - I've got the definition but I don't understand it. I am terrible at Set Theory most the time as I have never been taught it properly.

Next question is:

Open and Closed Sets - how can I find out when sets are open or closed? I sort of understand how to find the boundary of sets but beyond that I get a bit confused. And most of the questions involve a ball of radius epsilon.

I'm unsure if this topic should be in Set Theory - I've put it in here instead because the course isn't all Set Theory. Thanks.