Is it possible to prove Gamma function's duplication formula without complex analysis?
31027
Ahlfors "Prove the formula of Gauss"
63559
Is there a more complete way of proving this theorem (that I devised)? OR does this theorem already exist and have a name?
8970
Proving the cross product matrix tranformation identity with an alternative solution
119477
Understanding the Definition of $\int_\gamma f\ \overline{dz}$
156383
Proving a combinatorial identity without double counting
90475
Coordinate-free proof of $\operatorname{Tr}(AB)=\operatorname{Tr}(BA)$?
53426
Proof of a formula involving Euler's totient function: $\varphi (mn) = \varphi (m) \varphi (n) \cdot \frac{d}{\varphi (d)}$
26113
Proving the functional equation $\theta (x) = x^{-\frac{1}{2}} \theta (x^{-1})$ from the Poisson summation formula
21363
Prove the uniqueness of an inner product
22424
Has this "generalized semidirect product" been studied?
125719
Multiplicative inverse of a complex number.
143947
How to come up with the gamma function?
41028
Is there a combinatorial way to see the link between the beta and gamma functions?
12966
Riemann Sums proving function identically zero
76110
Proving that the zero vector is unique
60470
Sum of truncated Gammas and degenerate
79425
Prove the direct product of nonzero complex numbers under multiplication.