I need to determine whether the following set has accumulation points:
$0 \le \arg z<\pi/2 (z\ne 0)$
Would the accumulation point be z=0, as the set does not include 0? If not, does it not have any accumulation points as the set fans out to $\infty$ in the complex plane?
I think that I am just having a bit of trouble understanding the concept of an accumulation point.
Thank you for your help in advance!