2 papers
math.LO2001
On universal and epi-universal locally nilpotent groups
Rüdiger Göbel, Saharon Shelah, Simone Wallutis
In this paper we mainly consider the class LN of all locally nilpotent groups. We first show that there is no universal group in LN_lambda if lambda is a cardinal such that lambda…
math.LO2001
On the lattice of cotorsion theories
Rüdiger Göbel, Saharon Shelah, Simone Wallutis
We discuss the lattice of cotorsion theories for abelian groups. First we show that the sublattice of the well-studied rational cotorsion theories can be identified with the well-k…