Endomorphism rings of modules whose cardinality is cofinal to omega

Rüdiger Göbel, Saharon Shelah

The main result is Theorem: Let A be an R-algebra, mu, lambda be cardinals such that |A|<=mu=mu^{aleph_0}<lambda<=2^mu. If A is aleph_0-cotorsion-free or A is countably free, respe…