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math.LO1999
Large localizations of finite simple groups
Ruediger Goebel, Jose L. Rodriguez, Saharon Shelah
A group homomorphism eta:H-->G is called a localization of H if every homomorphism phi:H-->G can be `extended uniquely' to a homomorphism Phi:G-->G in the sense that Phi eta=phi. L…
math.LO1999
Almost free splitters
Ruediger Goebel, Saharon Shelah
Let R be a subring of the rationals. We want to investigate self splitting R-modules G that is Ext_R(G,G)=0 holds. For simplicity we will call such modules splitters. Our investiga…
math.LO1999
Cotorsion Theories and Splitters
Ruediger Goebel, Saharon Shelah
Let R be a subring of the rationals. We want to investigate self splitting R-modules G that is Ext_R(G,G)=0 holds and follow Schultz to call such modules splitters. Free modules an…