Browsing by Author "Vajner, Václav"

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Approaches to reflective hulls of subcategories

Author: Vajner, Václav Date: 1994 Reflective subcategories originated as a formal mathematical concept in the 1960's. Perhaps the first abstract definition of reflectivity can be attributed to P. Freyd who, in [Freyd 1960] and [Freyd 1964], gave a definition in terms of ... Read more
The tectonic development of the Namaqua mobile belt and its foreland in parts of the Northern Cape

Author: Vajner, Václav Date: 1974 The Namaqua Mobile Belt extends from the south-western coast of Southern Africa through northern Namaqualand and adjacent parts of South West Africa to the south-western margin of the Kaapvaal Craton near Prieska. Its Precambrian tectonic ... Read more
A Wyler-type approach to categorical topology

Author: Vajner, Václav Date: 1989 Chapter 0 contains a summary of well-known terminology which will subsequently be used in the thesis. In Chapter 1 we begin by describing how topological categories may be viewed as categories of models corresponding to theories into the ... Read more

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