> < ^ Date: Thu, 22 Aug 1996 12:27:50 BST
> < ^ From: G. C. Smith <gcs@maths.bath.ac.uk >
< ^ Subject: Re: A little observation (may be important)

Dear GAP-forum,

Sebastian Egner asked about a function to test whether a given cyclotomic
field element is a root of unity.

The following article by my colleagues at Bath
is highly relevant:

"Effective Tests for Cyclotomic Polynomials," in Proceedings of
ISSAC 1988, Springer LNCS no.~368, P.~Gianni (Ed).
(R..J.~Bradford and J.H.~Davenport) MR 90m:11201 (11Y16; 11Y40). (1989)

Geoff Smith

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