is there any functions f(x) for which

f(x1+x2)=f(x1)+f(x2) other than the one given below?

f(x)=cx

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- Jan 4th 2012, 09:35 PMyuvatheyuvasolution for f(x1+x2)=f(x1)+f(x2)
is there any functions f(x) for which

f(x1+x2)=f(x1)+f(x2) other than the one given below?

f(x)=cx - Jan 4th 2012, 10:04 PMFernandoRevillaRe: solution for f(x1+x2)=f(x1)+f(x2)
Look here:

Cauchy's functional equation