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arXiv 0904.0787math.RT
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单模限制中的Weyl子模

Weyl submodules in restrictions of simple modules

Vladimir Shchigolev

摘要:

设F是特征p>0的代数闭域.假设SL_{n-1}(F)自然嵌入SL_n(F)中(在左上角或右下角)。证明了SL_{n-1}(F)上的某些Weyl模可以嵌入到限制L(ω)\downarrow_{SL_{n-1}(F)}中,其中L(ω)是一个简单的SL_n(F)-模.这使得我们可以从相应的Weyl模中的任何本原向量构造L(ω)\downarrow_{\SL_{n-1}(F)}中的新本原向量。最后给出了几个例子,证明了该结果的有效性.

英文摘要:

Let F be an algebraically closed field of characteristic p>0. Suppose that SL_{n-1}(F) is naturally embedded into SL_n(F) (either in the top left corner or in the bottom right corner). We prove that certain Weyl modules over SL_{n-1}(F) can be embedded into the restriction L(ω)\downarrow_{SL_{n-1}(F)}, where L(ω) is a simple SL_n(F)-module. This allows us to construct new primitive vectors in L(ω)\downarrow_{\SL_{n-1}(F)} from any primitive vectors in the corresponding Weyl modules. Some examples are given to show that this result actually works.

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