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arXiv 0812.1090math.RTmath.CO
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由Khovanov图代数III产生的最高权范畴:范畴O

Highest weight categories arising from Khovanov's diagram algebra III: category O

Jonathan Brundan, Catharina Stroppel

摘要:

证明了与gl(m+n)的子代数gl(m)× gl(n)相关联的抛物范畴O的整块Morita等价于广义Khovanov代数的拟遗传覆盖.虽然这个结果在原则上是已知的,但现有的证明是相当间接的,通过格拉斯曼的反常层。我们的新方法是完全代数的,利用Schur-Weyl对偶更高的水平。作为副产品,我们得到了对应于有限型A中二级权重的Rouquier意义下的2-Kac-Moody表示的具体组合构造。

英文摘要:

We prove that integral blocks of parabolic category O associated to the subalgebra gl(m) x gl(n) of gl(m+n) are Morita equivalent to quasi-hereditary covers of generalised Khovanov algebras. Although this result is in principle known, the existing proof is quite indirect, going via perverse sheaves on Grassmannians. Our new approach is completely algebraic, exploiting Schur-Weyl duality for higher levels. As a by-product we get a concrete combinatorial construction of 2-Kac-Moody representations in the sense of Rouquier corresponding to level two weights in finite type A.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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