Abstract
To solve problems of Gilbert Baumslag and Hanna Neumann, posed in the 1960’s, we construct a nontrivial variety of groups all of whose noncyclic free groups are non-Hopfian.
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Ivanov, S.V., Storozhev, A.M. Non-Hopfian Relatively Free Groups. Geom Dedicata 114, 209–228 (2005). https://doi.org/10.1007/s10711-005-1726-x
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DOI: https://doi.org/10.1007/s10711-005-1726-x