The conjugation representation and fusionless extensions
The conjugation representation and fusionless extensions
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共轭表示和无融合扩展
DOI:
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发表时间:
1971
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影响因子:
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通讯作者:
E. Formanek
中科院分区:
文献类型:
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作者:
E. Formanek
Let G be a finite group with center Z. G acts on it- self by conjugation, and this induces a permutation representation P of G/Z. It has been conjectured that every complex irreducible representation of G/Z occurs in P. This paper gives a counterexam- ple to this conjecture. Let G be a finite group with center Z. G acts on itself by conjugation and this action yields a permutation representation P of G. P is in fact a representation of G/Z, and this motivates the following question, asked by Richard Roth (2): Does every complex irreducible representation of G/Z occur in P? The answer is no, and the purpose of this paper is to give a counter- example. Lemma 1. Suppose R is a one-dimensional representation of G with kernel K. Then R occurs in P iff K contains the centralizer of some ele-