Question: do non functions have domain range?
Answer: It is important to note that not all functions have the set of real numbers as their domain. For instance, the function f(x)=1x f ( x ) = 1 x is not defined for x=0 , because you cannot divide a number by 0 . In this case, the domain of f is the set of all real numbers except 0 . That is, x≠0 x ≠ 0 .