Complex Number System

The set of ​ (a)   is the set of all numbers written in the form $$a+bi$$ , where a and b are real numbers.

The term $$a$$ is called the​ ​ (a)   , and the term $$bi$$ is called the ​ ​ (b)   .

The set of ​ (a)   is the set of all numbers written in the

form a + bi, where a and b are real numbers and b is not equal to 0.​

A ​ (a)   is a number of the form a + bi, where a is equal to 0 and b is not equal to 0.

Which set does this symbol represent?

(a)  

Which set does this symbol represent?

(a)  

Which set does this symbol represent?

(a)  

Which set does this symbol represent?

(a)  

Which set does this symbol represent?

(a)  

Which set does this symbol represent?

(a)