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I am REALLY bad at proofs. I never know where to start. I only have the definitions of closure and interior. I feel like they threw us in the deep end

I've written like 3pages, but mostly just pictures.

interior: a is an element of A^int iff there exists r>0 with B(a,r) subset of A

and

closure: a is an element of A^closure iff for all r>0, B(a,r)(and)A are not empty