A remark on the Alperin-Mckay conjecture
A remark on the Alperin-Mckay conjecture
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DOI:
10.1215/kjm/1250283553
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发表时间:
2004
影响因子:
--
通讯作者:
M. Murai
中科院分区:
文献类型:
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作者:
M. Murai
Let G be a finite group and p a prime. For an irreducible character χ of G, let ht χ be the height of χ (defined in terms of the p-block of G to which χ belongs). Let N be a normal subgroup of G. We define htN (χ), the N -height of χ, by htN (χ) = ht χ − ht ξ, where ξ is an irreducible constituent of χN . Clearly htN (χ) does not depend on the choice of ξ. In [M2] we have shown that it always holds that htN (χ) 0. In the present paper we are concerned with the number of irreducible characters χ with htN (χ) = 0. Let B be a block of G with defect group D. Let k0(B) be the number of irreducible characters in B of height 0. We recall the Alperin-McKay conjecture: