Friday, March 24, 2017

Cauchy functional equation over the complex field

It is known that the only measurable solutions to the Cauchy functional equation f(x+y)=f(x)+f(y) are the linear ones (x,yR). Does the same hold if we take x,yC?
Edit: After the first answer, I rephrase my question: Are the only measurable functions f:CC which satisfy the Cauchy functional equation linear or anti-linear (that is of the form f(z)=aˉz+b)?

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