On intra-regular semigroups
On inverse categories with split idempotents
We present some special properties of inverse categories with split idempotents. First, we examine a Clifford-Leech type theorem relative to such inverse categories. The connection with right cancellative categories with pushouts is illustrated by simple examples. Finally, some basic properties of inverse categories with split idempotents and kernels are studied in terms of split idempotents which generate (right or left) principal ideals of annihilators.
On inverse semigroups the closure of whose set of idempotents is a Clifford semigroup.
On irreducible matrix semigroups.
On -ideals of semirings.
On Kim's conjecture.
On Konieczny's conjecture of Boolean matrices.
On la-semigroup defined by a commutative inverse semigroup
On lattice ordered periodic semigroups
On lattices embeddable into subsemigroup lattices. III: Nilpotent semigroups.
On left absolutely flat monoids.
On left --liberal semigroups
In this paper the equivalence on a semigroup in terms of a set of idempotents in is defined. A semigroup is called a -liberal semigroup with as the set of projections and denoted by if every -class in it contains an element in . A class of -liberal semigroups is characterized and some special cases are considered.
On left canellative semigroups.
On left, right and two-sided cancellable elements of semigroups.
On linear algebraic semigroups. III.
On low-complexity bi-infinite words and their factors
In this paper we study bi-infinite words on two letters. We say that such a word has stiffness if the number of different subwords of length equals for all sufficiently large. The word is called -balanced if the numbers of occurrences of the symbol a in any two subwords of the same length differ by at most . In the present paper we give a complete description of the class of bi-infinite words of stiffness and show that the number of subwords of length from this class has growth order...
On L-Semi-Groups.
On ideals and subgroups of a semigroup
On (m, n)-Regular Semigroups
On (m, n)-regular semigroups.