Is there exist a function defined on the real or complex numbers that, restricted to the integers, is equal to the factorial?
107686
Proof that the gamma function is an extension of the factorial function
99894
Does there exists an entire function $f$ such that $f(0)=1$ and $|f(z)|\leq \frac{1}{|z|} $ for all $|z|\geq 5$?
32316
Are all integers fractions?
103568
Possibility of finding a such function?
97534
Ruby factorial function
70262
Can the axiom of choice be used to define the real numbers?
11453
Find a real function $f:\mathbb{R}\to\mathbb{R}$ such that $f(f(x)) = -x$?
31900
Induction on Real Numbers
90447
Dividing factorials is always integer
2796
How to tell Mathematica that certain variables are real/imaginary, integer-valued, etc
112348
Defining the Complex numbers
63314
Triangular Factorials
30519
"Real" cardinality, say, $\aleph_\pi$?
58636
Do the real numbers and the complex numbers have the same cardinality?
47166
Is there a function whose inverse is exactly the reciprocal of the function, that is $f^{-1} = \frac{1}{f}$?
149328
A function such that $f:\mathbb C \to \mathbb C$ such that $f(z)f(iz)=z^2$ satisfies $f(z)+f(-z)=0$.(MADHAVA-2020)
139411
Finding $\pi$ factorial