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On the p-rank of Ext(A,B) for countable abelian groups A and B |
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| Authors: | Saharon Shelah Lutz Strüngmann |
| Institution: | 1. Institute of Mathematics, The Hebrew University of Jerusalem, Givat Ram, Jerusalem, 91904, Israel 2. Mathematics Department, Rutgers University, New Brunswick, NJ, USA 3. Faculty of Mathematics, University of Duisburg-Essen, 45117, Essen, Germany |
| Abstract: | In this note we show that the p-rank of Ext(A,B) for countable torsion-free abelian groups A and B is either countable or the size of the continuum. |
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