Exactness and stability in homotopical algebra

Details Exactness and stability in homotopical algebra Exactness and stability in homotopical algebra

2000-08-31

arxiv.org/abs/math/0008236v1

Mathematics

Algebraic Topology

24 pages

Scientific paper

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'.

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