A Levi class L(ℳ) generated by a class ℳ of groups is a class of all groups in which the normal closure of each element belongs to ℳ. It is stated that there exist finite groups G such that a Levi class L(qG), where qG is a quasivariety generated by a group G, has infinite axiomatic rank. This is a solution for [The Kourovka Notebook, Quest. 15.36]. Moreover, it is proved that a Levi class L(ℳ), where ℳ is a quasivariety generated by a relatively free 2-step nilpotent group of exponent ps with a commutator subgroup of order p, p is a prime, p ≠ 2, s ≥ 2, is finitely axiomatizable.
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Translated from Algebra i Logika, Vol. 57, No. 5, pp. 587-600, September-October, 2018.
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Shakhova, S.A. The Axiomatic Rank of Levi Classes. Algebra Logic 57, 381–391 (2018). https://doi.org/10.1007/s10469-018-9510-9
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DOI: https://doi.org/10.1007/s10469-018-9510-9