Different functional equations than Cauchy type? $2f(xy)=f(x)+f(y)$
For $y = 1$ we obtain $f(x) = f(1)$ so $f$ is constant.
Different functional equations than Cauchy type? $2f(xy)=f(x)+f(y)$
For $y = 1$ we obtain $f(x) = f(1)$ so $f$ is constant.
For $y = 1$ we obtain $f(x) = f(1)$ so $f$ is constant.