Тензорное произведение полугрупп и максимальные полуструктурные образы
The tensor product of groupoids
On totally SLA-simple semigroups
The tensor product of right groups
-systems of unary algebras. II: Maximal and minimal subalgebras of the direct products of unary algebras
On SLA-ideals
-systems of unary algebras. I: On maximal and greatest -classes of the direct product of unary algebras
Professor Robert Šulka is 70
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