# Subquotient categories of the affine category $\mathcal O$ at the critical level

• ### Peter Fiebig

Universität Erlangen-Nürnberg, Germany

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## Abstract

We introduce subquotient categories of the restricted category $\mathcal O$ over an affine Kac–Moody algebra at the critical level and show that some of them have a realization in terms of moment graph sheaves.