# Question: 5 for each of the sets in the above problems...

###### Question details

5. For each of the sets in the above problems, which one is
compact?

a) Let A = {z = x + iy | − 1 x 1, −1 < y < 1}.

b) Let A = { 1/n | n = 1, 2, 3, ...}.

c) Let R(r1, r2) = {z 2 C | r1 < |z| < r2}.

d) Let A = { 1n+1}1j=1 be a sequence of point in the unit disk
(1).

COMPLEX ANALYSIS