05365166

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05365166 Downey, Rod Montalb\'an, Antonio The isomorphism problem for torsion-free abelian groups is analytic complete. J. Algebra 320, No. 6, 2291-2300 (2008). 2008 Elsevier Science (Academic Press), San Diego, CA EN torsion-free abelian groups isomorphism problem complexity

doi:10.1016/j.jalgebra.2008.06.007

The paper proves that the isomorphism problem for torsion-free abelian groups is $\Sigma_1^1$ complete. Cristian S. Calude (Auckland)