Count all the function f satisfying followings :
140112
How many number of functions are there?
153510
Questions about the existence of a function
117848
Find all entire functions
64339
Find $f$ where $f'(x) = f(1+x)$
19474
Find all solutions to the functional equation $f(x) +f(x+y)=y+2 $
104278
Finding function $f(x)$ which satisfy given functional equation
6680
Solve for all possible functions f: $|f(x)-f(y)|=2|x-y|$.
26754
Find all continuous functions satisfying $\int_0^xf=(f(x))^2+C$ for some constant $C \neq 0$.
110704
Find all functions $f$ such that $f(x)+f(\frac{1}{1-x})=x$
146055
Proving a set of functions is uncountable
150346
If $f$ is an increasing function defined on $[a,b]$ . Then, $f$ has countable number of discontinuities
136655
Find the range of the given function $f$
28392
Construct a monotone function which has countably many discontinuities
99917
What function satisfies $F'(x) = F(2x)$?
44293
Functions satisfying $f\left( f(x)^2+f(y) \right)=xf(x)+y$
28927
IMO 1987 - function such that $f(f(n))=n+1987$
40566
Counting surjective functions