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arXiv:math/0008236 [math.AT]AbstractReferencesReviewsResources

Exactness and stability in homotopical algebra

Marco Grandis

Published 2000-08-31Version 1

Exact sequences are a well known notion in homological algebra. We investigate here the more vague properties of 'homotopical exactness', appearing for instance in the fibre or cofibre sequence of a map. Such notions of exactness can be given for very general 'categories with homotopies' having homotopy kernels and cokernels, but become more interesting under suitable stability hypotheses, satisfied - in particular - by chain complexes. It is then possible to measure the default of homotopical exactness of a sequence by the homotopy type of a certain object, a sort of 'homotopical homology'.

Comments: 24 pages
Categories: math.AT, math.CT
Subjects: 55U35, 18G55, 55U15
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