How many possible $1:1$ functions are here that satisfy the given condition?
38260
How many functions are possible to create in this example?
39090
Finding functions such that $f(g(x)) = f(x)g(x)$
141225
Number of all bijective functions from A to A.
90435
Prove that there exist linear functionals $L_1, L_2$ on $X$
44293
Functions satisfying $f\left( f(x)^2+f(y) \right)=xf(x)+y$
112636
How many continuous function $f(x)$ exist such that $\int_{0}^{1}f(x)\big(1-f(x)\big)\mathrm dx = \frac{1}{4}$?
76209
Inequalities for combinations of $\int f $ and $\int (1/f)$ where $m\le f\le M$ on an interval
70266
1-1 correspondence between [0,1] and [0,1)
109942
Find continuous functions such that $f(x+y)+f(x-y)=2[f(x)+f(y)]$
2142
Finding a set of continuous functions with a certain property 2
28286
About finding the function such that $f(xy)=f(x)f(y)-f(x+y)+1$
100465
Does there exist a continuous bijection from $(-1,1) \to (-1,1]$?
110142
1-1 Function Composition
111756
How do I prove that then $f(x) = 1$ for some $x ∈ [0, 1]$?
55840
Number of functions from n-element set to {1, 2, …, m}
62709
Functions that are sets of all function - proofs
82222
Determine the number of functions $f: \{1,2,3....,1999\}\to \{2000,2001,2002,2003\}$satisfying the condition that $f(1)+f(2)+...f(1999)$ is odd.