Finding multiple value in Complex Analysis

*To*: mathgroup at smc.vnet.net*Subject*: [mg105140] Finding multiple value in Complex Analysis*From*: Steven Siew <stevensiew2 at gmail.com>*Date*: Sun, 22 Nov 2009 06:09:26 -0500 (EST)

Given a complex number ( -1+2I ) and an expression z^(1/2) How do I find all the possible values like z == -Sqrt[-1 + 2 I] || z == Sqrt[-1 + 2 I] I can find it using Reduce[z^2== (-1+2I),{z}] But this leaves me with a problem of how to convert Z^(1/2) into Z^2 So given an arbitrary expression of Z, how do I convert it to a form which I can use the function Reduce to find the multiple solutions. Steven Siew