On varieties of regular -semigroups, II
On weakly commutative semigroups
On -operators in an arbitrary semigroup
On -ideals and generalized -ideals in semigroups
On -semigroups
One element extensions of commutative semigroups
One remarkable property of the bicyclic semigroup
One simple result concerning imprimitivity relations of monoids of transformations and its applications.
One-Sided Bases of Semigroups
Onesided inverses for 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 .
Operators and products in the lattice of existence varieties of regular semigroups.
Operators , and in the classes of -semigroups and -semirings.
Order and domains of attraction of control sets in flag manifolds.
Order relations on symmetric semigroups of transformations and on their homomorphic images.
Order theoretic variants of the fundamental theorem of compact semigroups.
Ordered semigroups containing minimal and maximal elements.
Ordered sets which support inverse semigroups : Three examples.
Ordering D-classes and computing Schein rank is hard.