[Note from moderator: reference was mentioned before, but is more complete below] Don't know if this got through already as myu mail has been acting up: There is also Drinfeld's *math.KT/0210114* [abs <http://arxiv.org/abs/math.KT/0210114>, ps <http://arxiv.org/ps/math.KT/0210114>, pdf <http://arxiv.org/pdf/math.KT/0210114>, other <http://arxiv.org/format/math.KT/0210114>] : Title: *DG quotients of DG categories* Authors: * Vladimir Drinfeld <http://arxiv.org/find/math/1/au:+Drinfeld_V/0/1/0/all/0/1>* Comments: 50 pages, Latex; some typographical errors corrected, some references added Subj-class: K-Theory and Homology; Algebraic Geometry; Algebraic Topology; Category Theory jim Marco Grandis wrote:
Following Andree Ehresmann's posting, and again in partial reply to Jean Benabou, I would like to add some considerations on the quotient of a category modulo a subcategory.
With best regards
Marco Grandis