Geodesic
The test rank of a soluble product of free Abelian groups
Sbornik. Mathematics, Tome 199 (2008) no. 4, pp. 495-510 Cet article a éte moissonné depuis la source Math-Net.Ru

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We consider the variety $\mathbb A^l$ of all soluble groups of derived length at most $l$, $l\geqslant2$. Suppose that a finitely generated group $G$ is a free product in the variety $\mathbb A^l$ of Abelian torsion-free groups. It is proved that the test rank of $G$ is one less than the number of factors. A test set of elements is written out explicitly. Bibliography: 27 titles. 
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     title = {The test rank of a~soluble product of free {Abelian} groups},
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Ch. K. Gupta; E. I. Timoshenko. The test rank of a soluble product of free Abelian groups. Sbornik. Mathematics, Tome 199 (2008) no. 4, pp. 495-510. http://geodesic.mathdoc.fr/item/SM_2008_199_4_a1/

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