The Combinatorics of Category O over symmetrizable Kac-Moody Algebras
The Combinatorics of Category O over symmetrizable Kac-Moody Algebras
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对称性Kac-Moody代数上O类组合学
DOI:
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发表时间:
2003
期刊:
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通讯作者:
P. Fiebig
中科院分区:
文献类型:
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作者:
P. Fiebig
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.