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math.LO2000
It is consistent with ZFC that B_1-groups are not B_2-groups
Saharon Shelah, Lutz Strüngmann
A torsion-free abelian group B of arbitrary rank is called a B_1-group if Bext^1(B,T)=0 for every torsion abelian group T, where Bext^1 denotes the group of equivalence classes of…
math.LO2000
The failure of the uncountable non-commutative Specker Phenomenon
Saharon Shelah, Lutz Strüngmann
Higman proved in 1952 that every free group is non-commutatively slender, this is to say that if G is a free group and h is a homomorphism from the countable complete free product…