Question: 3. (a) Is the interval (0, 1) open (set) in R?. (b) Is the subset D = {z : r E (0, 1), y

3. (a) Is the interval (0, 1) open (set) in R?. (b) 

3. (a) Is the interval (0, 1) open (set) in R?. (b) Is the subset D = {z : r E (0, 1), y = 0} open (set) in C?.

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