English

Filtrations in abelian categories with a tilting object of homological dimension two

Representation Theory 2010-07-21 v1 K-Theory and Homology

Abstract

We consider filtrations of objects in an abelian category \catA\catA induced by a tilting object TT of homological dimension at most two. We define three disjoint subcategories with no maps between them in one direction, such that each object has a unique filtation with factors in these categories. This filtration coincides with the the classical two-step filtration induced by torsion pairs in dimension one. We also give a refined filtration, using the derived equivalence between the derived categories of \catA\catA and the module category of End\catA(T)opEnd_\catA (T)^{op}. The factors of this filtration consist of kernel and cokernels of maps between objects which are quasi-isomorphic to shifts of End\catA(T)opEnd_\catA (T)^{op}-modules via the derived equivalence RHom\catA(T,)\mathbb{R}Hom_\catA(T,-).

Keywords

Cite

@article{arxiv.1007.3428,
  title  = {Filtrations in abelian categories with a tilting object of homological dimension two},
  author = {Bernt Tore Jensen and Dag Madsen and Xiuping Su},
  journal= {arXiv preprint arXiv:1007.3428},
  year   = {2010}
}