Which kind of functions $f(x, \ y)$ can be written as $g(x)\cdot h(y)$?
72254
Is that true that not every function $f(x,y)$ can be writen as $h(x) g(y)$?
29647
Do there exist functions satisfying $f(x+y)=f(x)+f(y)$ that aren't linear?
27960
Is there a name for function with the exponential property $f(x+y)=f(x) \cdot f(y)$?
120960
$f,g$ such that $\int fg = \int f \int g$
37976
Find all functions $f$ such that $(x+y)f(x)+f(y^2)=(x+y)f(y)+f(x^2)$
98363
Expanding two-variable function $f(x,y)$ over the complete sets $\{ g_{i}(x) \}$ and $\{ h_{j}(y) \}$
150776
Are there parabolic and elliptical functions analogous to the circular and hyperbolic functions $\sinh$, $\cosh$, and $\tanh$?
20568
Does the following have a solution for f(x,y)?
69734
how to find all functions such that $f\left( x^{2} - y^{2} \right) = ( x - y )( f(x) + f(y) )$
139019
Polynomial satisfying $f(x) = f'(x) \cdot f''(x)$
95976
Given a PRF $F$ , is $G(s) = F_s(1)\|F_s(2)\|\cdots \|F_s(n+1)$ a PRG?
89257
Give an example of a function $f:\mathbb{R}^2 \mapsto \mathbb{R}^2$ such that
43956
Differentiating $f(x)^{g(x)}$
54137
Find a non-negative function on [0,1] such that $t\cdot m(\{x:f(x) \geq t\}) \to 0$ that is not Lebesgue Integrable
72694
Proving that $f(x) = g(x)$ for some $x \in [a,b]$ if $f,g$ continuous, $f(a)  g(b)$
5625
Entire function with vanishing derivatives?
23186
$f: \mathbb{R^2} \to \mathbb{R}$ a $C^\infty$ function such that $f(x,0)=f(0,y)=0$ then exists $g$ such that $f(x,y)=xy\, g(x,y)$