On the characterization of primal partial algebras by strong regular hyperidentities.
On varieties generated by Boolean clones.
Green's-like relations on algebras and varieties.
Unsolid and fluid strong varieties of partial algebras.
Clone automorphisms and hypersubstitutions.
Minimal algebras and category equivalences
Strong regular varieties of partial algebras I
Varieties generated by two-element majority algebras and their equivalences
Categorical equivalences of varieties generated by algebras and
Präprimale Algebren, die arithmetische Varietäten erzeugen
Solid varieties of semigroups.
Hyperassociative varieties of semigroups.
Pre-solid varieties of semigroups
Pre-hyperidentities generalize the concept of a hyperidentity. A variety is said to be pre-solid if every identity in is a pre-hyperidentity. Every solid variety is pre-solid. We consider pre-solid varieties of semigroups which are not solid, determine the smallest and the largest of them, and some elements in this interval.
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