The R_\infty property for abelian groups

Karel Dekimpe, Daciberg Lima Gonçalves

DOI: http://dx.doi.org/10.12775/TMNA.2015.066

Abstract


It is well known there is no finitely generated abelian group which has the $R_\infty$ property. We will show that also many non-finitely generated abelian groups
do not have the $R_\infty$ property, but this does not hold for all of them! In fact we construct an uncountable number of infinite countable abelian groups
which do have the $R_{\infty}$ property.
We also construct an abelian group such that the cardinality of the Reidemeister classes is uncountable for any automorphism of that group.


Keywords


Reidemeister number; twisted conjugacy classes; Reidemeister classes; $R_\infty$ property; Abelian group

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References


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