On the abelianization of derived categories and a negative solution to Rosicky's problem

Details On the abelianization of derived categories and a negative solution to Rosicky's problem On the abelianization of derived categories and a negative solution to Rosicky's problem

2011-02-16

arxiv.org/abs/1102.3240v1

Mathematics

Category Theory

24 pages

Scientific paper

We prove for a large family of rings R that their lambda-pure global dimension is greater than one for each infinite regular cardinal lambda. This answers in negative a problem posed by Rosicky. The derived categories of such rings then do not satisfy the Adams lambda-representability for morphisms for any lambda. Equivalently, they are examples of well generated triangulated categories whose lambda-abelianization in the sense of Neeman is not a full functor for any lambda. In particular we show that given a compactly generated triangulated category, one may not be able to find a Rosicky functor among the lambda-abelianization functors.

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