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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DOI: https://doi.org/10.14232/actasm-013-072-0
Key words and phrases
- semigroup
- variety
- lattice of varieties
- commutative variety overcommutative variety
- permutative variety
- modular element
- lower-modular element
- upper-modular element
- distributive element
- codistributive element
- standard element
- costandard element
- neutral elemet