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Displaying similar documents to “On three types of simplicial objects”

Loop spaces of the Q-construction

A. Neeman (2000)

Fundamenta Mathematicae

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Giffen in [1], and Gillet-Grayson in [3], independently found a simplicial model for the loop space on Quillen's Q-construction. Their proofs work for exact categories. Here we generalise the results to the K-theory of triangulated categories. The old proofs do not generalise. Our new proof, aside from giving the generalised result, can also be viewed as an amusing new proof of the old theorems of Giffen and Gillet-Grayson.

Cochains and homotopy type

Michael A. Mandell (2006)

Publications Mathématiques de l'IHÉS

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Finite type nilpotent spaces are weakly equivalent if and only if their singular cochains are quasi-isomorphic as E algebras. The cochain functor from the homotopy category of finite type nilpotent spaces to the homotopy category of E algebras is faithful but not full.