Two variable functional equation
111556
Solving functional equation $f(x+y)+f(x-y)=2f(x)\cos y$?
105497
A function satisfying a series equation
157744
Cauchy's functional equation with composite function: $gf(x+y)=gf(x)+gf(y)$
35281
$1992$ IMO Functional Equation problem
82823
Attractive Boxed Equations
125667
Limit of a function of two variables
13086
Overview of basic facts about Cauchy functional equation
62111
Functional Equation $f(mn)=f(m)f(n)$.
55693
The functional equation $ f \big( x - f ( y ) \big) = f \big( f ( y ) \big) + x f ( y ) + f ( x ) - 1 $
32599
Solution to the functional equation $f(x^y)=f(x)^{f(y)}$
117418
Showing that the image of a function is $\mathbb{C}$ if it satisfies a nice functional equation
146719
Functional equation $f(r \cos \varphi)+f(r \sin \varphi)=f(r)$
38032
Finding the M.G.F of product of two random variables.
20568
Does the following have a solution for f(x,y)?
17175
Problem in solving functional equation $f(x^2 + yf(x)) = xf(x+y)$
81720
$f(x) + f(x+f(y)) = y + f(f(x) + f(f(y)))$
133646
real analysis -functional equation