Joint papers of Ulrich and Shelah

ShUl:1065 [arXiv:arXiv:1804.08523]
Shelah+Ulrich, $\le_{SP}$ can have infinitely many classes
ShUl:1141 2018-04-25 [pdf] [ps] [abstract] [arXiv:arXiv:1804.08152]
Shelah+Ulrich, Torsion-free abelian groups are consistently $a\Delta\frac{1}{2}$-complete


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