On the structure of dual semigroups
On the structure of dual semigroups
On three lattices that belong to every semigroup
On totally SLA-simple semigroups
On transformation semigroups which are -semigroups.
On t-semigroups.
On -operators in an arbitrary semigroup
On -ideals and generalized -ideals in semigroups
One-sided -ideals and -ideals in semirings.
One-sided principal ideals in the direct product of two semigroups
A necessary and sufficient condition is given for a) a principal left ideal in to be equal to the direct product of the corresponding principal left ideals , b) an -class to be equal to the direct product of the corresponding -classes .
Order theoretic variants of the fundamental theorem of compact semigroups.
Ordered semigroups containing minimal and maximal elements.
Ordering D-classes and computing Schein rank is hard.