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Topological hulls revisited. (English) Zbl 0677.18005
This is a highly technical paper in which the author studies certain kinds of closure operators on categories. He deals with what he calls “concrete categories over a base category”. Section 0 is an introduction. Section 1 is entitled concrete categories. In section 2 he discusses final completions and closure operators. Section 3 deals with topological hulls. Finally section 4 deals with injectivity and CCCT hulls. Some of the ideas are motivated by topos theory and lattice theory.
Reviewer: H.Gonshor
18B30 Categories of topological spaces and continuous mappings (MSC2010)
18D15 Closed categories (closed monoidal and Cartesian closed categories, etc.)
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