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math.GR2019
-free cogenerators
Manfred Dugas, Daniel Herden, Saharon Shelah
We prove in ZFC that an abelian group is cotorsion if and only if for every -free group , and discuss some consequences and related r…
math.GR2019
Strongly bounded groups of various cardinalities
Samuel M. Corson, Saharon Shelah
Strongly bounded groups are those groups for which every action by isometries on a metric space has orbits of finite diameter. Many groups have been shown to have this property, an…