how come for any given f(x) a y could have multiple values of x, while x has only a single y value
8072
Why Is a Function Defined As Having Only One Y-Value Output?
1102
Way to determine if X and Y are both over 0
31642
Values obtained in case of a recursive function
6680
Solve for all possible functions f: $|f(x)-f(y)|=2|x-y|$.
7358
For each $y \in \mathbb{R}$ either no $x$ with $f(x) = y$ or two such values of $x$. Show that $f$ is discontinuous.
49211
Solving $f(x+y) = f(x)f(y)f(xy)$
58023
What is the purpose of a function being surjective?
71049
Functional equation $f(xy)=f(x)+f(y)$ and continuity
20568
Does the following have a solution for f(x,y)?
66544
Piecewise Function, Explanation of Extra Case
4612
What is the distinction between DownValues, UpValues, SubValues, and OwnValues?
153942
Solution of functional equation $f(x+y)=f(x)+f(y)+y\sqrt{f(x)}$
72254
Is that true that not every function $f(x,y)$ can be writen as $h(x) g(y)$?
111756
How do I prove that then $f(x) = 1$ for some $x ∈ [0, 1]$?
122615
Mapping multiple parameters of a function to specific values
99827
For what values will f(x) be necessarily one-one?
157417
Understanding the definition of a multiple (double) root