Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4597146 | Journal of Pure and Applied Algebra | 2011 | 20 Pages |
Abstract
We show that three different kinds of cohomologies – Baues–Wirsching cohomology, the (S∗,O)-cohomology of Dwyer and Kan, and the André–Quillen cohomology of aΠ-algebra – are isomorphic, under certain assumptions. This is then used to identify the cohomological obstructions in three general approaches to realizability problems: the track category version of Baues and Wirsching, the diagram rectifications of Dwyer, Kan, and Smith, and the Π-algebra realization of Dwyer, Kan, and Stover. Our main tool in this identification is the notion of a mapping algebra: a simplicially enriched version of an algebra over a theory.
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