Constructs K1, an AEC of torsion-free abelian groups that is not finitely tame but is countably tame, plus families K2(2^μ) that fail tameness below any regular uncountable μ below the first measurable cardinal.
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Examples of non-tame abstract elementary classes of abelian groups
Constructs K1, an AEC of torsion-free abelian groups that is not finitely tame but is countably tame, plus families K2(2^μ) that fail tameness below any regular uncountable μ below the first measurable cardinal.