Connectedness, Disconnectedness and Closure Operators, a More General Approach

Let X be an arbitrary category with an (E,M)-factorization structure for sinks. A notion of constant morphism that depends on a chosen class of monomorphisms is introduced. This notion yields a Galois connection that can be seen as a generalization of the classical connectedness-disconnectedness correspondence (also called torsion-torsion free in algebraic contexts). It is shown that this Galois connection factors through the collection of all closure operators on X with respect to M. Mathematics Subject Classification (1991): 18A20, 18A32, 06A15.