On a generalized small-object argument for the injective subcategory problem
On congruence lattices in a category
On generic separable objects.
Orthogonality and closure operators
Pro-reflections and pro-factorizations
Remarks on topologically algebraic functors
Several constructions for factorization systems.
Small-fibred semitopological functors without small-fibred initial completions
Sur les genres d'esquissabilité des catégories modelables (accessibles) possédant les limites d'indexations finies (resp. finies et non vides, finies et connexes, finies et connexes et non vides)
The 3-by-3 lemma for regular Goursat categories.
The category of uniform spaces as a completion of the category of metric spaces
A criterion for the existence of an initial completion of a concrete category universal w.r.tḟinite products and subobjects is presented. For metric spaces and uniformly continuous maps this completion is the category of uniform spaces.
The Krull-Schmidt theorem for categories of finitely generated modules over valuation domains.
The Linton theorem revisited
The reflectiveness of covering morphisms in algebra and geometry.
The semigroup of Fredholm operators.
The separated extensional Chu category.
The strong amalgamation property and (effective) codescent morphisms.
The tower and regular decomposition
Topologically-algebraic structure functors full reflective or coreflective restrictions of semitopological functors
Weak subobjects and weak limits in categories and homotopy categories