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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is there any functions f(x) for which
f(x1+x2)=f(x1)+f(x2) other than the one given below?
f(x)=cx
Look here:
Cauchy's functional equation