# Physical meaning of the addition of Re[z] and Im[z], given Re[z] and Im[z] satisfy KK relation.

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Recently I came into an expression of Re[z] + Im[z], where, Re[z] and Im[z] satisfy the Kramers–Kronig relations. Wiki shows a page explaining like this, but the real part and imaginary part are separate. I'm just wondering if there is anyone who ever came across an expression like Re[z] + Im[z]. Any comment is appreciated.

edited Jan 10, 2017

It must be a typo; the imaginary unit $i$ is missing at Im(z).

Can you give a reference to where this happend?

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