Varietal free products of bands.
Varieties generated by free completely simple semigroups.
Varieties generated by semigroups of order four.
Varieties of completely regular semigroups generated by Mal'cev products.
Varieties of finite categories
Varieties of groupoids associated with involuted restrictive bisemigroups of binary relations.
Varieties of groupoids determined by short linear identities
Varieties of left distributive semigroups
Varieties of operator semigroups representing partitions.
Varieties of quasigroups determined by short strictly balanced identities
Weak alg-universality and -universality of semigroup quasivarieties
In an earlier paper, the authors showed that standard semigroups , and play an important role in the classification of weaker versions of alg-universality of semigroup varieties. This paper shows that quasivarieties generated by and are neither relatively alg-universal nor -universal, while there do exist finite semigroups and generating the same semigroup variety as and respectively and the quasivarieties generated by and/or are quasivar-relatively -alg-universal and -universal...
Алгоритмические проблемы в многообразиях полугрупп
Блокирующие множества термов
Вложимость рекурсивно определенных инверсных полугрупп в конечно определенные.
Категоричные квазимногообразия абелевых группоидов и квазигрупп.
Марковские свойства бернсайдовских многообразий полугрупп
Матричные иерархии языков первого порядка и их приложения.
Многоoбразия финитно-аппроксимируемых полугрупп
Многообразия с конечным числом подквазимногообразий.
Многообразия со счетным числом подквазимногообразий.