Titlebook: Categorical Closure Operators; Gabriele Castellini Textbook 2003 Springer Science+Business Media New York 2003 Abelian group.Boundary valu

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Epimorphismsosure operator appeared in [G.]. This result was then generalized to an arbitrary category in [C.], where the setting of a concrete category over an arbitrary category . was used and the assumption of . being epireflective was removed. The final general version of this result that used the current n

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Connectednesser of papers were published on this subject and on possible generalizations of it. However, most of them used the common approach of first defining a notion of constant morphism and then using it to introduce a notion of connectedness and disconnectedness, accordingly. Castellini and Hajek in [CH] w