> < ^ Date: Fri, 15 Jan 1993 12:22:56 +0100
> < ^ From: Dave L. Johnson <dlj@maths.nott.ac.uk >
< ^ Subject: Re: a question to HNN extensions

Dear Gap-forum,
especially Toni. Yes, this is correct. The stable letter in an HNN-extension
appears with exponent-sum zero in every relator and so has infinite order
even in the abelianised group.

Dave Johnson


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