Displaying similar documents to “The Extraordinary Derived Category.”

Topos based homology theory

M. V. Mielke (1993)

Commentationes Mathematicae Universitatis Carolinae

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In this paper we extend the Eilenberg-Steenrod axiomatic description of a homology theory from the category of topological spaces to an arbitrary category and, in particular, to a topos. Implicit in this extension is an extension of the notions of homotopy and excision. A general discussion of such homotopy and excision structures on a category is given along with several examples including the interval based homotopies and, for toposes, the excisions represented by “cutting out” subobjects....