On a generalized small-object argument for the injective subcategory problem
On binary coproducts of frames
The structure of binary coproducts in the category of frames is analyzed, and the results are then applied widely in the study of compactness, local compactness (continuous frames), separatedness, pushouts and closed frame homomorphisms.
On essential ring embeddings and the epimorphic hull of .
On functors which are lax epimorphisms.
On hereditary and product-stable quotient maps
It is shown that the quotient maps of a monotopological construct A which are preserved by pullbacks along embeddings, projections, or arbitrary morphisms, can be characterized by being quotient maps in appropriate extensions of A.
On projectiveness in H-closed spaces
On some properties of pure morphisms of commutative rings.
On strong monomorphisms and strong epimorphisms.
On the pullback stability of a quotient map with respect to a closure operator.
On the reflective hull problem
On the Whitehead theorem in shape theory II
On Underlying Functors in General and Topological Algebra.
On weak monomorphisms and weak epimorphisms in the category of pro-groups.
In this paper we characterize weak monomorphisms and weak epimorphisms in the category of pro-groups. Also we define the notion of weakly exact sequence and we study this notion in the category of pro-groups.
Orthogonality and closure operators