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arXiv 1208.3236math.RT
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关于Kirillov-Reshetikhin模的多重分次推广

On multigraded generalizations of Kirillov-Reshetikhin modules

Angelo Bianchi, Vyjayanthi Chari, Ghislain Fourier, Adriano Moura

摘要:

研究了一类Z+^l-分次李代数的具有有限维分次片的Z^l-分次模范畴.我们还考虑了某些Serre子范畴与许多同构类的简单对象。我们构造了这些范畴中的简单模的投射分解,并计算了简单模之间的Ext群.我们证明了这些Serre子范畴中单模的投射覆盖可看作Kirillov-Reshetikhin模的多重分次推广,并给出了计算其分次特征标的递归公式.

英文摘要:

We study the category of Z^l-graded modules with finite-dimensional graded pieces for certain Z+^l-graded Lie algebras. We also consider certain Serre subcategories with finitely many isomorphism classes of simple objects. We construct projective resolutions for the simple modules in these categories and compute the Ext groups between simple modules. We show that the projective covers of the simple modules in these Serre subcategories can be regarded as multigraded generalizations of Kirillov-Reshetikhin modules and give a recursive formula for computing their graded characters.

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