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math.LO2021
The Diagonal Strong Reflection Principle and its fragments
Sean Cox, Gunter Fuchs
A diagonal version of the strong reflection principle is introduced, along with fragments of this principle associated to arbitrary forcing classes. The relationships between the r…
math.LO2021
Salce's problem on cotorsion pairs is undecidable
Sean Cox
Salce \cite{MR565595} introduced the notion of a \emph{cotorsion pair} of classes of abelian groups, and asked whether every such pair is \emph{complete} (i.e., has enough injectiv…