# Proof: if f holomorphic then f(z)=λz+c

#### Seijo

##### New member
Hello. I need a bit of help or a hint maybe..

I am to show that if f: C -> C is a holomorphic function that is of the form f(x+iy) = u(x) + i*v(y) where u and v are real functions,
then f(z) = λz+c where λ is a real number and c is a complex one.

How would I begin to prove this?

Last edited:

#### Sudharaka

##### Well-known member
MHB Math Helper
Hello. I need a bit of help or a hint maybe..

I am to show that if f: C -> C is a holomorphic function that is of the form f(x+iy) = u(x) + i*v(y) where u and v are real functions,
then f(z) = λz+c where λ is a real number and c is a complex one.

How would I begin to prove this?

Try using the Cauchy-Riemann equations since $$f$$ is holomorphic.