Topological triangulated categories
  In this paper we explain certain systematic differences between algebraic and topological triangulated categories. A triangulated category is algebraic if it admits a differential graded model, and topological if it admits a model in the form of a stable cofibration category. The precise statements use the 'n-order' of a triangulated category, for a natural number n. The n-order is a non-negative integer (or infinity) and measures `how strongly' n annihilates objects of the form Y/n. We show the following results: the n-order of an algebraic triangulated category is infinite; for every prime p, the p-order of a topological triangulated category is at least p-1; the p-order of the p-local stable homotopy category is exactly p-1. In particular, the p-local stable homotopy category is not algebraic for any prime p. As a tool we develop certain foundations about enrichments of cofibration categories by Delta-sets; in particular we generalize the theory of `framings' (or `cosimplicial resolutions') from model categories to cofibration categories. 
Stefan Schwede
math.AT