Specht modules decompose as alternating sums of restrictions of Schur modules
Specht modules decompose as alternating sums of restrictions of Schur modules
复制标题
Specht 模块分解为 Schur 模块的限制的交替总和
DOI:
10.1090/proc/14815
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发表时间:
2020
影响因子:
1
通讯作者:
Speyer, David E.
中科院分区:
文献类型:
--
作者:
Assaf, Sami H.;Speyer, David E.
Schur modules give the irreducible polynomial representations of the general linear group. Viewing the symmetric groupas a subgroup of, we may restrict Schur modules toand decompose the result into a direct sum of Specht modules, the irreducible representations of. We give an equivariant Möbius inversion formula that we use to invert this expansion in the representation ring forforlarge. In addition to explicit formulas in terms of plethysms, we show the coefficients that appear alternate in sign by degree. In particular, this allows us to define a new basis of symmetric functions whose structure constants are stable Kronecker coefficients and which expand with signs alternating by degree into the Schur basis. References
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