Geodesic
On one A.\,I.~Mal'cev's Question from the ``Kourovskaya Notebook''
Modelirovanie i analiz informacionnyh sistem, Tome 19 (2012) no. 4, pp. 67-71

Voir la notice de l'article provenant de la source Math-Net.Ru

It is shown that the derived subgroup of the free group is not first-oder definable.
Keywords: free group, derived subgroup, first-oder definable subgroup. 
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     title = {On one {A.\,I.~Mal'cev's} {Question} from the {``Kourovskaya} {Notebook''}},
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V. G. Durnev. On one A.\,I.~Mal'cev's Question from the ``Kourovskaya Notebook''. Modelirovanie i analiz informacionnyh sistem, Tome 19 (2012) no. 4, pp. 67-71. http://geodesic.mathdoc.fr/item/MAIS_2012_19_4_a5/