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Special elements in lattices of semigroup varietie

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Abstract

We survey results concerning special elements of eight types (modular, sublattices, namely, the lattices of commutative varieties, of permutative three of its sublattices, namely, the lattices of commutative varieties, of Ježek, McKenzie, Shaprynskiĭ Volkov and the author. Several open questions are formulated.

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Acknowledgements

The author thanks Drs. Olga Sapir and Edmond W. H. Lee for a number of useful suggestions on improvement of the initial version of this survey.

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Communicated by M. B. Szendrei

Supported by the Ministry of Education and Science of the Russian Federation (project 2248), grant of the President of the Russian Federation for supporting of leading scientific schools of the Russian Federation (project 5161.2014.1) and by Russian Foundation for Basic Research (grant 14-01-00524).

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Vernikov, B.M. Special elements in lattices of semigroup varietie. ActaSci.Math. 81, 79–109 (2015). https://doi.org/10.14232/actasm-013-072-0

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