Are there other self-similar functions like $e^x$ and $\cos x$?
64339
Find $f$ where $f'(x) = f(1+x)$
107400
Can there be an injective function whose derivative is equivalent to its inverse function?
64836
Functions that are always less than their derivatives
51991
What is the integral of $e^{\cos x}$
62966
Find all functions $f(x)$ such that $f\left(x^2+f(y)\right)$=$y+(f(x))^2$
38354
A result similar to Schwarz lemma
84317
Iterated self-composition of arbitrary function
114307
Are Exponential and Trigonometric Functions the Only Non-Trivial Solutions to $F'(x)=F(x+a)$?
90316
Do "Parabolic Trigonometric Functions" exist?
137815
Additive but not $\sigma$-additive function
42745
Validity and Equivalence of two definitions of the real exponential function
37546
Fourier Series for $|\cos(x)|$
7945
Approximate $|x|$ with a smooth function
28011
Does there exists an entire function such that for each $|z|>C$ for some constant $C$, $|f(z)|=|z|+1$?
153355
Given $S \in B(Y^{*}, X^{*})$, does there exist $T\in B(X,Y)$ such that $S=T^{*}$?
27960
Is there a name for function with the exponential property $f(x+y)=f(x) \cdot f(y)$?
12213
Similarity of real matrices over $\mathbb{C}$