Torsion-free groups and amalgamated products

Baumslag, G.; Karrass, A.; Solitar, D.

doi:10.1090/S0002-9939-1970-0260876-9

Torsion-free groups and amalgamated products

Authors: G. Baumslag, A. Karrass and D. Solitar
Journal: Proc. Amer. Math. Soc. 24 (1970), 688-690
MSC: Primary 20.52
DOI: https://doi.org/10.1090/S0002-9939-1970-0260876-9
MathSciNet review: 0260876
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Abstract: There exist continuously many finitely generated torsion-free groups which cannot be obtained from the infinite cyclic group by repeatedly forming the free product with an amalgamated subgroup of any two groups already obtained, taking subgroups, and forming ascending unions.

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