# MathSciDoc: An Archive for Mathematician ∫

#### Category TheoryRepresentation Theorymathscidoc:1701.04005

Arkiv for Matematik, 53, (2), 383-400, 2014.4
We show that the standard graded cover of the well-known category $\mathcal{O}$ of Bernstein–Gelfand–Gelfand can be characterized by its compatibility with the action of the center of the enveloping algebra.
@inproceedings{michael2014unicity,
title={Unicity of graded covers of the category $\mathcal{O}$ of Bernstein–Gelfand–Gelfand},
author={Michael Rottmaier, and Wolfgang Soergel},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203640928175086},
booktitle={Arkiv for Matematik},
volume={53},
number={2},
pages={383-400},
year={2014},
}

Michael Rottmaier, and Wolfgang Soergel. Unicity of graded covers of the category $\mathcal{O}$ of Bernstein–Gelfand–Gelfand. 2014. Vol. 53. In Arkiv for Matematik. pp.383-400. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203640928175086.