If $f:D\to D’$ is analytic and $u: D'\to R$ is harmonic then the composition of $u$ and $f$ is harmonic in $D$.
How can I show that the above statement is true/false? Can anyone help me?
If $f:D\to D’$ is analytic and $u: D'\to R$ is harmonic then the composition of $u$ and $f$ is harmonic in $D$.
How can I show that the above statement is true/false? Can anyone help me?