Is there a function which, composed with itself, will output $e^x$?
66406
How to calculate $f(x)$ in $f(f(x)) = e^x$?
97767
How do I construct a function $\operatorname{sog}$ such that $\operatorname{sog}\circ\operatorname{sog} = \log$?
158610
Why is the differentiation of $e^x$ is $e^x$?
125707
A simple proof (hopefully) for $2^x \neq 0$
107609
Function whose third derivative is itself.
131844
When does $(e^a)^b = e^{ab}$ hold?
29647
Do there exist functions satisfying $f(x+y)=f(x)+f(y)$ that aren't linear?
118778
What's the inverse operation of exponents?
107240
Exponential Operator in C++
131424
which of the following is NOT a possible value of $(e^{f})''(0)$??
62067
Inverse function of $x^x$
103568
Possibility of finding a such function?
55175
Is the function $f(x) = x^2 - 2x$ one-to-one?
64545
Continuum between addition, multiplication and exponentiation?
54735
What is the closed form of $\int e^{x^2} \, dx$?
21003
Comparing $\pi^e$ and $e^\pi$ without calculating them
50451
The linear dependence of exponential functions