A brief journey through extensions of rational groups
Friedenberg, Stefan1 ; Wolf, Paul1
1 Hochschule Stralsund, Germany
Rendiconti del Seminario Matematico della Università di Padova, Tome 140 (2018), pp. 123-128.

Let A and B 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(A,B) especially considering some interesting classes of torsion-free pairs.

Publié le :
DOI : 10.4171/RSMUP/5
Classification : 20, 00
Mots clés : Abelian group, extension, rational group, torsion-free
Friedenberg, Stefan 1 ; Wolf, Paul 1

1 Hochschule Stralsund, Germany 
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     author = {Friedenberg, Stefan and Wolf, Paul},
     title = {A brief journey through extensions of rational groups},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {123--128},
     publisher = {European Mathematical Society Publishing House},
     address = {Zuerich, Switzerland},
     volume = {140},
     year = {2018},
     doi = {10.4171/RSMUP/5},
     mrnumber = {3880214},
     zbl = {1472.20120},
     url = {http://archive.numdam.org/articles/10.4171/RSMUP/5/}
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Friedenberg, Stefan; Wolf, Paul. A brief journey through extensions of rational groups. Rendiconti del Seminario Matematico della Università di Padova, Tome 140 (2018), pp. 123-128. doi : 10.4171/RSMUP/5. http://archive.numdam.org/articles/10.4171/RSMUP/5/

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