$k'=k$ only for $e^x$
10431
Prove that $C\exp(x)$ is the only set of functions for which $f(x) = f'(x)$
94077
Proof of linear independence of $e^{at}$
152104
How do I prove that $ij = k?$
145507
Is $K[a,b]=K(a,b)$ for algebraic $a, b$?
1440
Are the any non-trivial functions where $f(x)=f'(x)$ not of the form $Ae^x$
142344
The solution of ODE $k'(x) = r(k(x))$ is infinitely differentiable if $r$ is
142725
The general solution of $x^a = a^x$ for real $a >0$
139121
Evaluating $\int _0 ^1 x^k(\ln x)^m dx$ for integer $k$ and $m$
142922
How to prove that $e^x$ is convex?
67588
Why does $|e^{ix}|^2 = 1$?
27901
Proving $\sum\limits_{i=1}^k | \langle x,v_i \rangle \langle y,v_i\rangle| \leq \|x\|\cdot \|y\|$
66946
show that $(i+k)! > i!k!$ algebraically
112707
Must $Q^\mathsf{T}Q = I$ if $(Qx)^\mathsf{T}(Qx) = x^\mathsf{T}x$
52354
Given a idempotent endomorphism, show that $M = \ker(f) \oplus \ker (f-\text{id}_M)$
139531
If $f'/f=g'/g$ at every $1/n$ then $f=kg$ for some complex number $k$
87813
How to show that for all k, $k! \ge (k/2)^{k/2}$
135641
Algebraic independence of exponentials