Quasi-radicals and Radicals in Categories
Quasi-reflections and limits
Quasi-varieties of presheaves.
Récursivité graphique (1e partie) : catégorie des fonctions récursives primitives formelles
Reflections in locally presentable categories
Reflections on distal spaces
Reflective and coreflective subcategories of Unif (and Top)
Reflective functors via nearness
Reflective Kleisli subcategories of the category of Eilenberg-Moore algebras for factorization monads.
Reflective subcategories and dense subcategories
Reflective subcategories of Poset and Top
Reflective-coreflective equivalence.
Regular -spaces
Regularising natural dualities.
Relations between certain theories in functional analysis and general topology
Remarks on epireflective subcategories of the category of topological modules.
Remarks on quintessential and persistent localizations.
Remarks on the Lifting of Algebras over Henselian Pairs.
Semiconvex compacta
We define and investigate a generalization of the notion of convex compacta. Namely, for semiconvex combination in a semiconvex compactum we allow the existence of non-trivial loops connecting a point with itself. It is proved that any semiconvex compactum contains two non-empty convex compacta, the center and the weak center. The center is the largest compactum such that semiconvex combination induces a convex structure on it. The convex structure on the weak center does not necessarily coincide...
Semilocalizations of exact and leftextensive categories