Question

all z belong to C, state whether the set is open, closed, or neither. i) 1< IzI <2 ii) im z>or=0 and 1 13 years ago

Answer 1

first is open because of the \(<\)

Answer 2

like this without the boundary

Answer 3

second one is the upper half part, but it includes the boundary on the bottom, so it is not open or closed

Answer 4

how can you draw these two sets?