The Mal'tsev operation on countably compact spaces
The structure of hemigroups.
The structure of hemigroups. (Short Communication).
The structure of semitopological monoids defined on compact connected 3-manifolds.
Théorie des groupoïdes symplectiques
Topological automorphism groups of chains.
It is shown that any set-open topology on the automorphism group A(X) of a chain X coincides with the pointwise topology and that A(X) is a topological group with respect to this topology. Topological properties of connectedness and compactness in A(X) are investigated. In particular, it is shown that the automorphism group of a doubly homogeneous chain is generated by any neighborhood of the identity element.
Topological Nearrings Whose Additive Groups are Euclidean.
Topological Rough Groups
The concept of topological group is a simple combination of the concepts of abstract group and topological space. The purpose of this paper is to combine the concepts of topological space and rough groups; called topological rough groups on an approximation space.
Topologies on free monoids induced by closure operators of a special type
Topologies on free monoids induced by families of languages