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math.GR2018★ 3 cited
Homogeneous structures with non-universal automorphism groups
W. Kubis, S. Shelah
We present three examples of countable homogeneous structures (also called Fraisse limits) whose automorphism groups are not universal, namely, fail to contain isomorphic copies of…
math.GR2018
Deeply concatenable subgroups might never be free
Samuel M. Corson, Saharon Shelah
We show that certain algebraic structures lack freeness in the absence of the axiom of choice. These include some subgroups of the Baer-Specker group and the Hawaiia…