Hi, just wondering where this line comes from [PLAIN]http://img514.imageshack.us/img514/4990/complq.jpg [Broken] Here's my beef: If we evaluate it at z=z_0, why are there still 'z's in (2.11)? Furthermore, isn't the congujate of f=u( )+iv( ) simply u( )-iv( )? The formula seems to have been evaluated at z* = z*_0. Not sure what's going on. Thanks  If this belongs in the homework thing forum place, sorry. Please move it.