I'm curious if it's possible to define a function that would have more than two functionvalues for one single x-value.
I know that it's possible to get two y-values by using the root (one positive, one negative: $\sqrt{4} = -2 ; +2$).
Is it possible to get three or more function values for one single x-value?
Best Answer
The concept of function is usually defined as a mapping from one $x$ to one $f(x)$.
There are such things as multiple-valued functions, though they're not strictly speaking functions.