On subsemigroup lattices of aperiodic groups.
On subsemigroups of transformation semigroups with two generators.
On super hamiltonian semigroups
The concept of super hamiltonian semigroup is introduced. As a result, the structure theorems obtained by A. Cherubini and A. Varisco on quasi commutative semigroups and quasi hamiltonian semigroups respectively are extended to super hamiltonian semigroups.
On syntacticity of finite regular semigroups.
On Takizawa's construction for E-unitary R-unipotent semigroups
On the additive semigroup of ordered semirings.
On the additive semigroup structure of semirings.
On the additive structure of a class of ordered semirings.
On the algebraic characterization of systems of partial mappings
On the arithmetic of arithmetical congruence monoids
Let ℕ represent the positive integers and ℕ₀ the non-negative integers. If b ∈ ℕ and Γ is a multiplicatively closed subset of , then the set is a multiplicative submonoid of ℕ known as a congruence monoid. An arithmetical congruence monoid (or ACM) is a congruence monoid where Γ = ā consists of a single element. If is an ACM, then we represent it with the notation M(a,b) = (a + bℕ₀) ∪ 1, where a, b ∈ ℕ and a² ≡ a (mod b). A classical 1954 result of James and Niven implies that the only ACM...
On the axiomatic rank of varieties generated by a semigroup or monoid with one defining relation.
On the Burnside problem for semigroups of matrices in the (max, + ) algebra.
On the categori-city of semigroup-theoretical properties.
On the Centralizer of a semigroup of group endomorphisms.
On the characterization of semilattices satisfying the descending chain condition and some remarks on distinguishing subsets
On the ...-class of a product.
On the classes of orderable semigroups in varieties.
On the closure of B2 ( ...,...).
On the closure of bisimple w-semigroups.
On the Complete Integral Closure of a Mori Domain