Realizable homotopy colimits

Details Realizable homotopy colimits Realizable homotopy colimits

2011-04-04

arxiv.org/abs/1104.0646v3

Mathematics

Algebraic Geometry

34 pages; some results generalized and the presentation is improved

Scientific paper

In this paper we prove that for any model category, the Bousfield-Kan construction of the homotopy colimit is the absolute left derived functor of the colimit. This is achieved by showing that the Bousfield-Kan homotopy colimit is moreover a realizable homotopy colimit, defined by means of a suitable 2-category of relative categories. In addition, in the case of exact coproducts, we characterize the realizable homotopy colimits that satisfy a cofinality property as those given by a formula following the pattern of Bousfield-Kan construction: they are the composition of a "geometric realization" with the simplicial replacement.

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