A question about algebraic numbers using Mathematica

*To*: mathgroup at smc.vnet.net*Subject*: [mg62762] A question about algebraic numbers using Mathematica*From*: Kent Holing <KHO at statoil.com>*Date*: Mon, 5 Dec 2005 03:37:01 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

I want to find the inverse of 2 - r in Q[r] where r is a root of the equation x^4 - 2c x^3 + (c^2 - 2a^2) x^2 + 2a^2 c x - a^2 c^2 = 0 for a, b and c integers. Can this be done for general a, b and c? (I know how to do it for specific given numerical values of a, b and c.) Kent Holing

**Follow-Ups**:**Re: A question about algebraic numbers using Mathematica***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>

**Re: A question about algebraic numbers using Mathematica***From:*Daniel Lichtblau <danl@wolfram.com>