Tensor products and dimensions of simple modules for symmetric groups
Tensor products and dimensions of simple modules for symmetric groups
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对称群简单模的张量积和维数
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发表时间:
1995
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通讯作者:
K. Erdmann
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作者:
K. Erdmann
LetK be an algebraically closed field of characteristic,p>0 and letDλ be the simple modules of the symmetric groupSr overK where λ is a p-regular partition ofr. The dimensions ofDλ for λ with at mostn parts are the same as the multiplicities of direct summands ofD⊗r whereE is the natural module for the groupGLn(K). Whenn=2 we determine generating functions for these multiplicities and hence for the dimensions ofDλ for all partitions λ with two parts. These can be expressed as rational functions of Chebyshev polynomials; and we obtain explicit formulae for the coefficients.