> < ^ Date: Thu, 06 Jan 1994 15:27:00 -0800
> < ^ From: Jacob Hirbawi <hirbawi@commquest.com >
> ^ Subject: expressions involving roots of unity

Suppose I have an expression involving roots of unity, such as : 

x := [ 0, 1, -3/5*E(20)+3/5*E(20)^9+1/5*E(20)^13-1/5*E(20)^17, 0 ];

is it possible to substitute every instance of E(n) in x with some other
function f(n) and have the new expression automatically evaluated? Thanks.

Jacob Hirbawi
Jcbhrb@CERF.net

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