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Isomorphism classes and zeta-functions of some nilpotent groups. II. (English) Zbl 1345.20030
Let \(G\) be a finitely generated group. The subgroup zeta function of \(G\), denoted by \(\zeta_G(s)\), is defined as the Dirichlet series associated to the sequence \(\{a_n(G)\}_n\), where \(a_n(G)\) is the number of subgroups of \(G\) of index \(n\). Zeta functions of groups were introduced by F. J. Grunewald, D. Segal and G. C. Smith: they proved in particular that \(\zeta_G(s)\) has remarkable properties when \(G\) belongs to the class of torsion-free finitely generated nilpotent groups (\(\mathcal T\)-groups). It is known that for the class of all \(\mathcal T\)-groups, the isomorphim classes are not determined by zeta functions. However this article gives a class of \(\mathcal T\)-groups with the property that if \(G_1\) and \(G_2\) belong to this class, then \(\zeta_{G_1}(s)=\zeta_{G_2}(s)\) if and only if \(G_1\) and \(G_2\) are isomorphic.
For part I see [the author, Tokyo J. Math. 36, No. 1, 163-175 (2013; Zbl 1287.20035)].
20E07 Subgroup theorems; subgroup growth
20F18 Nilpotent groups
11M41 Other Dirichlet series and zeta functions
Full Text: DOI Euclid
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