Abstract
We show that the structure of a block outside the critical hyperplanes of category O over a symmetrizable Kac-Moody algebra depends only on the corresponding integral Weyl group and its action on the parameters of the Verma modules. This is done by giving a combinatorial description of the projective objects in the block. As an application, we derive the Kazhdan-Lusztig conjecture for nonintegral blocks from the integral case for finite or affine Weyl groups. We also prove the uniqueness of Verma embeddings outside the critical hyperplanes.
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Fiebig, P. The Combinatorics of Category O over symmetrizable Kac-Moody Algebras. Transformation Groups 11, 29–49 (2006). https://doi.org/10.1007/s00031-005-1103-8
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DOI: https://doi.org/10.1007/s00031-005-1103-8