Reflective Kleisli subcategories of the category of Eilenberg-Moore algebras for factorization monads.
Reflective Mac Neille completions of fibre-small categories need not be fibre-small
Reflective subcategories and dense subcategories
Reflective subcategories of Poset and Top
Reflective-coreflective equivalence.
Reflectors and Coreflectors on Diagrams
Regular -spaces
Regularising natural dualities.
Relations between certain theories in functional analysis and general topology
Relative continuity of the functor
Relative homological categories.
Relative injectivity as cocompleteness for a class of distributors.
Remarks on epireflective subcategories of the category of topological modules.
Remarks on quintessential and persistent localizations.
Remarks on reflections
Remarks on subdirect representations in categories
Remarks on the Lifting of Algebras over Henselian Pairs.
Remarks on topologically algebraic functors
Representation of semigroups by products of simple graphs
Representation-finite algebras and multiplicative bases.