Abstract
We study the restricted Verma modules of an affine Kac-Moody algebra at the critical level with special emphasis on their Jordan-Holder multiplicities. The Feigin-Frenkel conjecture gives a formula for these multiplicities that involves the periodic Kazhdan-Lusztig polynomials. We prove this conjecture for all subgeneric blocks and for the case of anti-dominant simple subquotients.
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