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arXiv 2007.04919math.RTmath.GR
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Character表和缺陷组

Character tables and defect groups

Benjamin Sambale

摘要:

设B是具有亏群D的有限群G的块.证明了图D的中心指数由图G的特征标表决定。特别地,我们证明了D是循环的当且仅当B包含一个“大”族的不可约p-共轭字符。更一般地,对于阿贝尔D,我们得到了一个明确的公式,指数的D的字符值。在小的情况下,甚至D的同构类型也在这种情况下确定。此外,它可以从字符表中读取是否|D/D '|其中D '表示D的换位子群。我们还提出了一个新的特征表方面的幂零块的特征。

英文摘要:

Let B be a block of a finite group G with defect group D. We prove that the exponent of the center of D is determined by the character table of G. In particular, we show that D is cyclic if and only if B contains a "large" family of irreducible p-conjugate characters. More generally, for abelian D we obtain an explicit formula for the exponent of D in terms of character values. In small cases even the isomorphism type of D is determined in this situation. Moreover, it can read off from the character table whether |D/D'|=4 where D' denotes the commutator subgroup of D. We also propose a new characterization of nilpotent blocks in terms of the character table.

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