I just checked in clojure.contrib.complex-numbers, a complex number  
library. For the moment it implements only comparison and arithmetic,  
but I intend to add maths functions later.

Complex numbers are represented by struct maps with two keys, :real  
and :imag. The real and imaginary parts can be any number kind (or,  
in fact, anything for which implementations of  
clojure.contrib.generic exist). There is a specialized subtype  
representing pure imaginary numbers, which eliminates many of the  
useless operations with zero that complex libraries often suffer from.

Feedback is welcome!

Konrad.

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