Ok, to be honest, I have no idea where to start for this problem, and I',m not sure to to annotate some of it:
Let f: D-->R and let c be an accumulation point of D. Assume lim f(x) = L, L>0
x->c
Prove using the epsilon- delta argument there exists a deleted neighborhood N*(c,epsilon) so that f(x) >0 for all xEN*(x, epsilon) (intersection) D.
That's all that was given, I have a final exam on Friday, any help would be greatly appreciated.