On a conjecture of Brown.
On a conjecture of Rhodes.
On a multiplication of semigroup varieties.
On a simple one-element extension of left zero semigroups
On anti-inverse semigroups.
On bases of completely simple semigroups identities.
On cross semigroup varieties and related questions.
On finite J-trivial monoids.
On groups in varieties of semigroups.
On medial local semigroups.
On modular elements of the lattice of semigroup varieties
A semigroup variety is called modular if it is a modular element of the lattice of all semigroup varieties. We obtain a strong necessary condition for a semigroup variety to be modular. In particular, we prove that every modular nil-variety may be given by 0-reduced identities and substitutive identities only. (An identity is called substitutive if the words and depend on the same letters and may be obtained from by renaming of letters.) We completely determine all commutative modular...
On M-Varieties generated by Power Monoids.
On permutability in semigroup varieties
The paper contains characterizations of semigroup varieties whose semigroups with one generator (two generators) are permutable. Here all varieties of regular -semigroups are described in which each semigroup with two generators is permutable.
On power commutative semigroups.
On recognition and compactification.
On regular implicit operations
On regular semigroup rings.
On semidirect and two-sided semidirect products of finite trivial monoids
On semidirect products of two finite semilattices.
On Semigroups Defined by the Identity xxy = y