1.  The set  2 |z| < 3 is

(a) open   ; (b) closed  ; (c) neither   .

2.  The set |z| < 3 is a domain because it is

(a) open   ; (b) connected  ; (c) both of these   .

3.  The point z = 1 is an accumulation point of |z| < 1.

(a) True  ; (b) False   .

4.  A discrete point set can have a point of accumulation.

(a) True   ; (b) False   .

Notes