Since any value of x only gives one value of y ane each value of y has one corresponding x value, we don't have to place any limits.
Also, all values of x gives a value for y, and all values for y are possible, we say that domain is x inRR and the range is yinRR, where inRR which means it contains all values in the real set (RR={0,-3,3.54,8.2223,1/3,e,pi,etc.})