Hi The example shows the following: (imag-part 1.1+2.2i) => 2.2i ; approximately but the definition states: (imag-part z) returns a2 where z = a1 + a2i So, should the imag-part return the value as a real or a complex? 2.2 or 2.2i ? cheers leppie http://www.codeplex.com/IronScheme http://xacc.wordpress.com