Standard objects in 2-braid groups
arXiv:1205.4206 · doi:10.1112/plms/pdu022
Abstract
For any Coxeter system we establish the existence (conjectured by Rouquier) of analogues of standard and costandard objects in 2-braid groups. This generalizes a known extension vanishing formula in the BGG category O.
23 pages. v2: final version