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arXiv 0904.0782math.RT
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A型群的Weyl模的局部判别法

A local criterion for Weyl modules for groups of type A

Vladimir Shchigolev

摘要:

设G是代数闭域上的泛Chevalley群,U^-是由所有除幂X_{α,m}生成的Dist(G)的子代数,α<0.我们猜想一个算法来确定是否Fe^+_ω \ne 0,其中F \in \U^-,ω是Weyl模Δ(ω)的一个支配权,e^+_ω是Weyl模Δ(ω)的一个最高权向量.该算法不使用Δ(ω)的基,并且类似于涉及逐步提升所研究的向量的不可约模的算法。对于任意的G,这个猜想在一个方向上被证明,而对于A型G,在两个方向上都被证明。

英文摘要:

Let G be a universal Chevalley group over an algebraically closed field and U^- be the subalgebra of Dist(G) generated by all divided powers X_{α,m} with α<0. We conjecture an algorithm to determine if Fe^+_ω\ne0, where F\in\U^-, ωis a dominant weight and e^+_ωis a highest weight vector of the Weyl module Δ(ω). This algorithm does not use bases of Δ(ω) and is similar to the algorithm for irreducible modules that involves stepwise raising the vector under investigation. For an arbitrary G, this conjecture is proved in one direction and for G of type A in both.

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