A brief journey through extensions of rational groups

  • Stefan Friedenberg

    Hochschule Stralsund, Germany
  • Paul Wolf

    Hochschule Stralsund, Germany

Abstract

Let and be rational groups, i.e. torsion-free groups of rank-1 and thus subgroups of the rational numbers. This paper gives a short overview of the structure of Ext() especially considering some interesting classes of torsion-free pairs.

Cite this article

Stefan Friedenberg, Paul Wolf, A brief journey through extensions of rational groups. Rend. Sem. Mat. Univ. Padova 140 (2018), pp. 123–128

DOI 10.4171/RSMUP/5